Fennel Seed Biscotti — twice-baked Italian biscuits with fennel and almonds

i. Origin & history

Biscotto comes from the Latin bis coctus, 'twice cooked', and twice-baking is one of the oldest ways of making bread and biscuits last. Roman legions and medieval sailors carried twice-baked rusks because, with almost all their moisture driven out, they did not go mouldy. In Italian today, biscotti simply means biscuits of any kind, but in English the word has come to mean exactly this style: a sliced, twice-baked, crunchy biscuit.

The most famous Italian version is the Tuscan cantuccio or biscotto di Prato, an almond biscotto associated with Prato and codified by local bakers in the nineteenth century. But flavoured twice-baked biscuits are found all over Italy, and aniseed flavours are among the oldest. Liguria and Sicily make anicini with anise seeds; Lazio has tozzetti, often with hazelnuts and anise; and in Calabria, Sicily and Puglia, wild and cultivated fennel seed flavours biscuits, taralli and breads. Fennel grows wild across the south, and its seeds were a cheap and plentiful alternative to imported anise.

Fennel seed biscotti, then, are not a single named regional classic so much as a natural meeting of the twice-baked tradition with one of the south's favourite flavourings. Home cooks in Italy and in Italian-American communities made them with whatever was at hand — almonds, olive oil or butter, orange or lemon zest — and they appear at Christmas, at christenings and weddings, and in the everyday biscuit tin.

Fennel's role in the kitchen goes back further still: Italians traditionally chew fennel seeds after a meal to aid digestion and freshen the breath, the same reason candied fennel seeds are offered after meals in India. A fennel biscotto with an espresso performs much the same function.

ii. Why biscotti are baked twice

The first bake cooks the dough log through, setting the egg and starch so it can be sliced cleanly. At this point the log is like a firm, slightly cakey loaf — still moist inside. Slicing it while warm (but not hot) and laying the slices flat for a second bake exposes the cut faces to dry heat, driving out the remaining moisture. The result is a biscuit that is crisp all the way through and, with so little water left, keeps for weeks.

Timing the slicing matters. Cut straight from the oven, the log crumbles; left until fully cold, it hardens and the crust shatters under the knife. About 10–15 minutes of cooling, then a sharp serrated knife used in a single, decisive sawing motion, gives clean slices.

The texture is controlled by the fat. Traditional Tuscan cantucci contain no butter or oil at all, only eggs, and are very hard — designed to be dipped. Adding a little olive oil or butter makes the biscotti more tender and easier to bite dry. This recipe uses a modest amount of olive oil, which suits fennel and keeps the biscotti crunchy but not jaw-breaking.

Toasting the fennel seeds briefly in a dry pan before crushing them lightly releases their aromatic oils and turns the flavour from raw and green to warm and sweet. Crushing them, rather than leaving them whole, spreads the flavour through the dough.

iii. Ingredients

Makes 30 servings · scroll the side panel to adjust

• 1½ tbsp fennel seeds
• 300 g plain flour
• 160 g caster sugar
• 1 tsp baking powder
• ¼ tsp salt
• 3 eggs
• 50 ml extra-virgin olive oil
• 1 orange, finely grated zest
• 1 tsp vanilla extract
• 120 g whole almonds, skin on
• 1 egg white, beaten, to glaze

Fennel seeds should be green-gold and fragrant; old, brown seeds taste dusty. For a stronger aniseed flavour, add a splash of sambuca or anisette with the eggs, as many southern Italian families do. Whole almonds with skins are traditional in cantucci and stay crunchy; pistachios or hazelnuts also work. Olive oil suits the Mediterranean flavour; 60 g melted butter gives a richer, more tender biscotto. Orange zest is the classic partner for fennel, though lemon is common too.

iv. Method

1. Heat the oven to 170 °C (340 °F), or 150 °C fan, and line a large baking tray with baking paper. Toast the fennel seeds in a dry pan for 1–2 minutes until fragrant, then crush lightly in a mortar.
2. Whisk the flour, sugar, baking powder, salt and crushed fennel in a large bowl. In another bowl, whisk the eggs, olive oil, orange zest and vanilla.
3. Stir the wet ingredients into the dry ones to form a soft, slightly sticky dough, then work in the almonds.
4. With floured hands, divide the dough in half and shape two logs about 25 cm long and 6 cm wide on the tray, well apart. Brush with egg white.
5. Bake for 25–30 minutes until the logs are risen, golden and firm to the touch, with small cracks on top.
6. Cool on the tray for 10–15 minutes. Reduce the oven to 150 °C (300 °F), or 130 °C fan. Transfer the logs to a board and cut on the diagonal into 1 cm slices with a serrated knife.
7. Lay the slices flat on the tray and bake for 10 minutes, turn them over and bake for 8–10 minutes more until dry and pale golden on both sides.
8. Cool completely on a rack; they crisp up further as they cool. Store in an airtight tin.

v. Tips & common mistakes

• Toast the fennel seeds. A minute in a dry pan transforms their flavour from green and raw to warm and sweet.
• Do not add extra flour. The dough should be soft and slightly sticky; flour your hands rather than the dough to shape it.
• Slice at the right moment. Too hot, and the logs crumble; too cold, and they shatter. About 10–15 minutes of cooling is ideal.
• Use a serrated knife. A sawing bread knife cuts cleanly through the almonds and crust without crushing the slice.
• Lower the heat for the second bake. The aim is to dry, not brown. High heat colours the biscotti before they are dry inside.
• Cool completely before storing. Warm biscotti release steam in a closed tin and turn soft.

vi. Variations

Fennel and orange is the classic pairing; fennel and lemon is lighter. Fennel and raisin biscotti are common in Sicily, and some bakers add pistachios or dried figs. Anicini use anise seed and no nuts. Cantucci are the plain almond version from Tuscany, often dipped in vin santo. Chocolate and fennel is a modern combination that works surprisingly well.

Related biscuits on DessertCat include the Jewish twice-baked mandelbrot, the Piedmontese hazelnut baci di dama, the Sienese ricciarelli and the crumbly Mantuan sbrisolona. A pinch of ground fennel is also a good addition to the Italian-style fig and walnut cake.

vii. Serving & storage

Serve fennel biscotti with espresso or cappuccino in the morning, or after dinner with a glass of vin santo, Marsala or sweet muscat for dipping. They are also good alongside a bowl of fruit, ice cream or zabaione, and make an excellent gift packed in a jar or tin.

Stored in an airtight tin at room temperature, they keep for 3–4 weeks. If they soften in humid weather, re-crisp them for 5 minutes in a low oven. They also freeze well for up to 3 months.

ix. More from Turkish & Mediterranean

• Mandelbrot — twice-baked almond bread
• Ricciarelli — soft Sienese almond biscuits
• Baci di Dama — hazelnut sandwich cookies
• Sbrisolona — almond-cornmeal crumble
• Kourabiedes — Greek almond shortbread
• Fig and Walnut Cake — olive-oil fig cake