A golden baked log of almond biscotti on a wooden board, half of it cut on the diagonal into slices that show whole almonds and pine nuts, a serrated knife beside it

Biscotti from Scratch, the Prato Way

September 30, 2026

The biscotti Prato is known for are the city's own biscuit: pale gold, cut on the slant, full of skin-on almonds and the odd pine nut, and made without a gram of butter. Antonio Mattei opened his shop there in 1858, and the firm still gives the traditional Prato recipe as five ingredients: flour, sugar, fresh eggs, almonds and pine nuts (shop Mattei biscotti di Prato). There is no oil in it, no milk and no baking powder. Egg holds the whole thing together, and that one fact explains how the dough behaves in your hands, why the finished biscuit is so hard, and why Tuscans traditionally dip it.

Making it at home takes a bowl, a whisk and one sheet pan. No mixer. The recipe turns on two short windows, the few minutes after the first bake when the log will slice cleanly and the point in the second bake when the slices are dry enough to come out. Both are described below by what you can see and feel.

Twice cooked, and older than the almonds

Biscotto comes from the Latin bis coctus, cooked twice, the same root that gives English the word biscuit. In Tuscany this one is called a cantuccio, or cantuccino. The Accademia della Crusca's dictionary files the word as a diminutive of canto in its sense of a side or part, and the Tuscan producers' association adds another candidate, the Latin cantellus, a piece or slice of bread. Either way the name fits a biscuit cut from a loaf.

The same dictionary, in the edition begun in 1729, gives the baker's meaning in a single line: biscotto a fette, di fior di farina, con zucchero, e chiara d'uovo. A sliced biscuit of the finest flour, sugar and egg white. No almonds. The producers' association traces cantucci back to the Medici court in the second half of the sixteenth century, and those had no almonds either. Almond cantucci were not made across Tuscany until the twentieth century, which makes the almond the biscuit's newest ingredient. Prato got there early. Mattei was selling almond biscuits by 1858.

Why a dough with no fat bakes like this

In a butter cookie dough, fat is what keeps the crumb tender. Harold McGee explains in On Food and Cooking that fat coats the flour proteins and keeps them from bonding into a continuous network, which is where the baker's word "short" comes from. Take the fat out and egg is left as the only binder. Its proteins unfold in the heat and bond to one another, setting into a firm frame around the flour and the nuts. Once the second bake has driven the water out, that frame is dry and hard all the way through.

Two practical things follow. The raw dough will be stiff and slightly sticky, and adding flour to fight the stickiness only makes it crumbly. Damp hands work better. The finished biscuit is meant to snap, and the few seconds it spends in a glass of vin santo or a cup of coffee soften the outside while the middle stays crisp.

The fat dial

Any biscotti recipe sits somewhere on a line running from Prato's egg-only dough to the butter-creamed American style. The surprise is what sits in the middle. When the European Union registered Cantucci Toscani as a Protected Geographical Indication in 2016, the specification required butter and honey alongside flour, unpeeled sweet almonds, sugar and eggs, plus a raising agent, with whole almonds making up a fifth of the finished biscuit. Butter is the only fat it allows, at a floor of 1.5 percent of the dough, and multifloral honey goes in at 0.3 to 1.5 percent. Beyond a short list of optional extras such as salt, whole milk and flavorings, nothing else may go in, so the pine nuts are out. Even with that little butter, the recipe that carries Tuscany's legal name is richer than the one its most famous biscuit town is known for. Both are Tuscan. They sit at different points on the dial.

	Prato style (this recipe)	Tuscan IGP style	Butter-creamed style
What binds it	Egg only	Egg, with a little butter and honey	Egg and creamed butter
Change to this recipe	As written	Rub 30 g soft butter into the flour; swap 10 g of the sugar for 1 1/2 teaspoons honey; add 1/2 teaspoon baking powder; replace the pine nuts with 25 g more almonds	Follow the biscotti and butter cookies recipe guide, which creams 60 g butter with the sugar
Crumb	Fine, close and hard; snaps	Crunchy, then melts a little on the tongue	Crisp outside, cakier inside
Best eaten	Dipped in vin santo or espresso	Dipped, or with coffee	On its own
Dough in the hand	Stiff and tacky; shape with damp hands	Softer, shapes easily	Soft; spreads more in a warm kitchen

The specification calls for multifloral honey; at home a wildflower honey stands in, such as Bee Squared's alfalfa wildflower (shop Bee Squared alfalfa wildflower honey).

Ingredients, for about 34

175 g (1 1/4 cups) whole raw almonds, skin on
25 g (3 tablespoons) pine nuts
2 large eggs, plus 1 more large egg, separated: the yolk goes in the dough, the white is for the glaze
175 g (7/8 cup) granulated sugar
A pinch of fine sea salt
Finely grated zest of half an orange (optional; the Prato original has none)
250 g (2 cups) all-purpose flour, plus a little for the counter

Weigh the flour if you can. A lean dough has no fat to cover for an extra 20 grams of flour, and that much will keep it from coming together. The skins stay on the almonds. They give the cut face its brown-rimmed look, and the Tuscan specification requires unpeeled almonds too.

Method

1. Toast the almonds, lightly

Heat the oven to 350°F (175°C). Spread the almonds on a sheet pan and toast them for 6 to 8 minutes. Snap one in half: the inside should have gone from chalk white to ivory, and the pan should smell of toasted nuts. Stop well short of brown, because they will bake twice more inside the dough. The pine nuts stay raw, since they are small enough to color in the dough on their own. Let the almonds cool completely. Warm nuts melt the sugar around them and turn the dough gluey.

2. Make the dough

Whisk the two whole eggs, the extra yolk, the sugar, salt and zest in a large bowl for about two minutes, until the mixture is thick and pale and falls from the whisk in a ribbon. Tip in the flour and stir with a spatula until no dry flour remains and the mass looks shaggy, then turn it out onto a lightly floured counter. Scatter the nuts over it and knead briefly, folding and pressing, until they are spread evenly through the dough.

Now judge it. It should be stiff, a little tacky, and hold a fingerprint. If it crumbles and refuses to gather, work in water a teaspoon at a time. If it clings like wet clay, dust in one tablespoon of flour and no more; the stickiness is easier to handle with wet hands than to correct with flour.

3. Shape two logs

Line the sheet pan with parchment and cut the dough in half. Wet your hands under the tap, shake them off, and roll and pat each half into a log about 30 cm (12 in) long and 5 cm (2 in) wide. Set the logs at least 8 cm (3 in) apart, since they spread to about 7 cm in the oven, and press the tops a little flat. Keep both logs the same size so they bake at the same rate. The width you choose here becomes the length of the finished biscuit. Cut on the diagonal, a 7 cm log gives slices of about 9 cm, just inside the 10 centimeters the Tuscan producers give as the classic length.

4. Glaze and bake the logs

Beat the reserved egg white with a teaspoon of water and brush it over the tops and sides. Tuscan IGP producers brush their logs with a mix of water, egg and sweetener before baking, and the egg gives the crust its shine. Bake 25 to 30 minutes, turning the pan halfway through. The logs are ready when the tops are a deep, glossy gold and cracked along their length, the undersides are light brown, and the center springs back when pressed. Don't pull them early. An underbaked log is hard to rescue: the slices stay gummy in the middle and tear under the knife.

5. Slice while warm

Leave the logs on the pan for 5 to 10 minutes, until you can lift them onto a board without burning your fingers. This is the first window. Straight from the oven the crumb is soft enough to tear around the almonds; fully cold, it has set so hard that it shatters. Hold a long serrated knife at a steep diagonal and cut 1.5 cm (5/8 in) slices with long, light strokes, letting the teeth do the work instead of pressing down. When the blade meets an almond, keep sawing and it will go straight through. If a log has gone cold, warm it at 300°F for three minutes before cutting. The two ends are the cook's.

6. Dry the slices

Lower the oven to 300°F (150°C). Lay the slices on the pan cut side down, close together; they won't spread again. Bake 10 minutes, turn each one over, and bake 8 to 10 minutes more. This bake is for drying them out, and they should barely color. Take them out when both cut faces feel dry and slightly rough under a fingertip and have only the faintest tan. They will still flex a little in the middle while hot, which is the second window: judge by the surface, because the hardness arrives as they cool.

7. Cool completely, then store

Move the biscotti to a rack and leave them until they are at room temperature all the way through. Close them in a tin only then; trapped warmth condenses and softens them. McGee notes that sugar attracts and holds water, and that crisp baked goods take up moisture from the air and lose their crispness, so an airtight tin is what keeps them snapping. The Tuscan specification makes the same point. It requires cantucci to be packed inside the region because dry biscuits take up moisture from the air.

In a Denver kitchen

High-altitude charts tell bakers to cut the leavening, because, as Colorado State University puts it, leaveners act with more force at elevation. This dough has no leavening, so that rule does not apply. Two others do.

Liquid evaporates faster in thin, dry air. New Mexico State University's extension tables suggest adding 2 to 4 tablespoons of liquid per cup at 5,000 feet, and the eggs here come to roughly half a cup, so have 1 to 2 tablespoons of water ready in step 2 and add it a teaspoon at a time until the dough holds a fingerprint. In a dry Denver winter it may need all of it.

The oven correction applies too. NMSU recommends raising the temperature by 15 to 25°F, and CSU by no more than 25°F, to help set a batter before it can collapse. NMSU pairs the increase with 5 to 8 minutes less baking per half hour. For the logs, that means 365°F for the first bake, checked at 20 minutes and done by the same signs as at sea level. Leave the second bake at 300°F, since its job is drying and a hotter oven would only brown the cut faces, but begin checking the second side two or three minutes early.

The sugar reduction in the tables is optional at this elevation (NMSU gives zero to two tablespoons per cup), and this recipe does without it. If you are trying the IGP stop on the dial in Denver, use a scant half teaspoon of baking powder. One piece of CSU's advice holds for every batch: change one thing at a time and write it down. The rest of the kitchen is covered in the Denver altitude cooking guide.

When it goes wrong

What you see	Likely cause	Fix
Dough crumbles and won't form a ball	Too much flour, small eggs, or dry air	Knead in water a teaspoon at a time; weigh the flour next time
Dough sticks to everything	Nuts still warm, or extra-large eggs	Shape with damp hands instead of adding flour; cool the nuts fully
Logs flatten into a wide sheet	Dough too wet, or logs crowded	One more spoonful of flour; 8 cm between logs
Slices crumble or split around the almonds	Cut too cold, or pressed straight down	Slice 5 to 10 minutes out of the oven with a sawing stroke; rewarm a cold log for 3 minutes
Slices gummy in the center	First bake too short	Bake until the center springs back; for this batch, add a few minutes per side to the drying bake
Brown, bitter cut faces	Drying bake too hot, or almonds over-toasted	300°F for the second bake; toast almonds only to ivory
Soft the next day	Stored warm, or the tin was not airtight	Cool fully before storing; refresh at 300°F for 5 minutes and cool again

Anise, fennel or fig

Mattei has long made anise cantucci alongside the almond biscuits, so a teaspoon of lightly crushed anise seed, kneaded in with the nuts, has history behind it. A teaspoon of fennel seed can go in the same way (shop Burlap & Barrel Lucknow fennel seed). Fig works too. Le Dolcezze di Nanni bakes almond and fig cantucci (shop Nanni almond fig cantucci), and at home 60 g of chopped dried figs can stand in for the pine nuts and 35 g of the almonds, which keeps the weight of the add-ins the same and the dough just as stiff. Chopped fruit holds moisture, so give the second bake an extra two or three minutes per side.

At the table

The Tuscan way to end a meal with these is a plate of cantucci and a small glass of vin santo, the region's amber dessert wine, each biscuit dipped for a moment before eating. Mattei suggests coffee as the other partner. This is what an egg-only dough is built for.

There is more to talk about while the glass goes round. According to Mattei, the blue paper it has wrapped its biscuits in since the 1880s became an EU trademark in its own right in 2019, a color registered as a brand. Pellegrino Artusi, author of La scienza in cucina e l'arte di mangiar bene, wrote of Mattei that he had the genius of his craft and was honest and very hardworking. The Antonio Mattei producer guide tells the bakery's story at length, and the biscotti and butter cookies guide places cantucci among shortbread and the rest of the butter-cookie family.

Once you have baked the Prato version, any biscotto becomes easy to read. Every one is a decision about fat, made before the dough is mixed. A biscuit that snaps clean and softens in the glass sits near the egg-only end of the dial, and one that crumbles tenderly on the tongue sits nearer the butter. Bite into a bakery's biscotto with that in mind and you can tell where its baker set the dial.

The shop is at 263 Josephine Street in Cherry Creek, Denver. Products ship nationwide from theambrosianpantry.com.