Mandelbrot — Jewish twice-baked almond biscuits

i. Origin & history

Mandelbrot comes from the Ashkenazi Jewish communities of Central and Eastern Europe, and the name — Yiddish mandl, almond, and broyt, bread — describes its original form: a loaf of sweet almond dough that is sliced like bread. In Ukraine and parts of Russia the same biscuit is known as kamishbrot or kamish broit, and in North American Jewish homes it is often anglicised as 'mandel bread'.

Its kinship with Italian biscotti is obvious, and the two-stage bake is the same idea. How the technique reached Jewish kitchens is not documented; one common theory is that it came through Jewish communities in Italy and spread along trade routes into Central Europe, but twice-baked rusks were known across Europe, and the connection should be treated as likely rather than proven.

What makes mandelbrot distinctively Jewish is the oil. Under the dietary laws of kashrut, meat and dairy are not eaten together, so a dessert served after a meat meal on Shabbat or a holiday must be pareve — made with neither. Oil instead of butter makes mandelbrot pareve, which is why it became a standard Friday-night and holiday sweet. It also gives a more tender biscuit than biscotti, which are traditionally fat-free and very hard.

The biscuits keep for weeks, travel well and need no special equipment, so they also became a parcel biscuit: sent to students, soldiers and relatives, and baked in quantity for Rosh Hashanah, Purim and shiva visits. Jewish communities that emigrated to North America, South Africa and Australia took mandelbrot with them, and it is now as much a part of American Jewish home baking as rugelach.

ii. Why it is baked twice — and why oil instead of butter

The first bake cooks the dough through as a soft log, much like a cake. If you tried to slice the raw dough and bake the slices directly, they would spread into flat biscuits. Baking the log first sets its structure, so it can be cut into neat slices with straight sides.

The second bake is a drying stage. The slices are laid cut-side down and baked at a lower temperature until the surfaces are dry and lightly toasted. Moisture escapes from the cut faces, the sugars caramelise slightly, and the biscuit becomes crisp. How long you leave them decides the texture: a short second bake gives a tender, cakey mandelbrot; a long one gives something closer to a biscotto.

Oil changes the texture compared with butter. Liquid fat coats the flour proteins evenly and limits gluten development, giving a tender, slightly crumbly bite that stays crisp rather than rock-hard. It also keeps for longer, because oil does not go stale in the way butter does. And because oil is 100 per cent fat with no water, the dough is soft and sticky; chilling it for 30 minutes, or oiling your hands, makes shaping much easier.

Slicing is the delicate moment. The log is cut while still warm, when the crumb is firm enough to hold together but not yet brittle. Wait until it is cold and the nuts tear the slices apart; cut it hot and it squashes. A serrated knife used in a gentle sawing motion gives clean slices.

iii. Ingredients

Makes 30 servings · scroll the side panel to adjust

• 3 eggs
• 200 g sugar
• 180 ml neutral oil (sunflower or rapeseed)
• 1½ tsp vanilla extract
• ½ tsp almond extract
• 1 orange, finely zested
• 375 g plain flour
• 2 tsp baking powder
• ½ tsp fine salt
• 150 g whole or roughly chopped almonds, lightly toasted
• 3 tbsp sugar, for the topping
• 1 tsp ground cinnamon, for the topping

A neutral oil keeps the biscuits pareve and lets the almond flavour lead; sunflower or rapeseed are ideal. Toasting the almonds first (8 minutes at 180 °C) deepens their flavour considerably. The almond extract is a traditional booster, but use it sparingly — it can easily taste artificial. Orange zest is common in older family recipes; lemon is equally traditional. The cinnamon-sugar coating is typical of American Jewish versions; leave it off for a plainer biscuit. Many families add chocolate chips, dried cherries or walnuts in place of some of the almonds.

iv. Method

1. Heat the oven to 180 °C (350 °F), 160 °C fan, and line a large baking tray with baking paper. Mix the topping sugar and cinnamon in a small bowl.
2. Whisk the eggs and sugar together for 2 minutes until slightly pale, then whisk in the oil, vanilla and almond extracts and orange zest.
3. Whisk the flour, baking powder and salt together, then stir them into the egg mixture with a spoon until just combined. Fold in the almonds. The dough will be soft and sticky; chill it for 30 minutes if it is too loose to shape.
4. With oiled hands, divide the dough in two and shape each half into a log about 30 cm long and 7 cm wide on the tray, well apart. Sprinkle with half the cinnamon sugar.
5. Bake for 30–35 minutes, until the logs are golden, firm on top and cracked, and a skewer comes out clean. Cool for 10–15 minutes, until warm but not hot. Reduce the oven to 150 °C (300 °F), 130 °C fan.
6. Transfer the logs to a board and cut them on a slight diagonal into slices about 1.5 cm thick with a serrated knife, sawing gently.
7. Lay the slices cut-side down on the tray, sprinkle with the remaining cinnamon sugar, and bake for 10 minutes. Turn them over and bake for 8–10 minutes more, until dry and lightly golden on both sides.
8. Cool completely on a rack; they crisp up as they cool.

v. Tips & common mistakes

• Oil your hands, not the dough. Adding flour to make the dough easier to handle gives a dry, hard biscuit. Oiled hands or a 30-minute chill do the job without changing the recipe.
• Leave space between the logs. They spread to nearly twice their width in the oven; logs too close together merge into one slab.
• Slice at the right moment. 10–15 minutes out of the oven is the sweet spot. Cut cold, the slices crumble around the nuts.
• Decide your texture in the second bake. For soft, cakey mandelbrot bake only 5–6 minutes a side; for crisp, biscotti-like ones go to 10. They firm further as they cool, so judge by colour, not by feel.
• Use a lower heat for the second bake. At full temperature the edges burn before the centres dry out.
• Store them only when completely cold. Even a little residual warmth makes them steam and soften in the tin.

vi. Variations

Chocolate-chip mandelbrot is perhaps the most popular North American version, with chips in place of half the almonds. Marble mandelbrot swirls a cocoa dough through a plain one. Kamishbrot, the Ukrainian Jewish name, often refers to a slightly drier, less sweet version. Some families make a jam-filled log, rolled around apricot jam and nuts, which is closer to a sliced strudel. The Italian cantucci, made without fat, are harder and meant for dipping in vin santo; try them alongside our fennel-seed biscotti. Other Eastern European and Jewish bakes that share the same tables include babka, sernik and szarlotka.

vii. Serving & storage

Mandelbrot is served with tea or coffee after a Shabbat or holiday meal, set out in a bowl for visitors, or packed into tins as gifts. Unlike hard biscotti, it does not need dipping, though it is excellent with a glass of tea with lemon, which is how it was often eaten in Eastern Europe.

Store in an airtight tin at room temperature for up to 3 weeks; the oil keeps it from going stale. If the biscuits soften, crisp them for 5 minutes in a 150 °C oven. Both the baked biscuits and the unbaked logs freeze well for up to 3 months. Bake frozen logs from frozen, adding about 10 minutes to the first bake.

ix. More twice-baked and festive bakes

• Fennel-Seed Biscotti — Italian twice-baked biscuits
• Babka — braided Eastern European sweet bread
• Sernik — Polish baked cheesecake
• Ricciarelli — Sienese almond biscuits
• Mantecados — Andalusian almond crumble biscuits
• Kourabiedes — Greek almond shortbread