Lava Donut — a yeast doughnut with a molten chocolate heart

i. Origin & history

Filled doughnuts are old. Central Europe has its jam-filled Berliner and Krapfen, Poland its pączki, Italy its custard-filled bomboloni; in each case the doughnut is fried first and filled afterwards through a hole in the side. The lava doughnut reverses the order: the filling is sealed inside the raw dough and cooked with it, which is what lets it stay molten rather than set.

That idea comes from the molten chocolate cake. The French chef Michel Bras developed his coulant au chocolat — a small cake built around a frozen ganache core — in the early 1980s, and in New York Jean-Georges Vongerichten's molten chocolate cake, said to have begun as an under-baked chocolate sponge, made the style famous in the late 1980s and 1990s. By the 2000s 'lava cake' was on restaurant menus everywhere, and the word 'lava' had become shorthand for any dessert with a hot, flowing chocolate centre.

Applying it to doughnuts was a natural step in the craft-doughnut boom of the 2010s, which produced the cronut, the maple bacon donut and countless filled and topped variations. Lava doughnuts — sometimes called molten or 'volcano' doughnuts — appeared in independent doughnut shops, at fairs and in online recipes, with no single documented inventor. Chocolate is the classic filling, but salted caramel, peanut butter and hazelnut spread are all common.

Similar sealed-filling fried doughs exist elsewhere: Korea's hotteok encloses a brown-sugar filling that melts into syrup, and many Southeast Asian fried dough balls hide molten palm sugar. The lava doughnut is the chocolate, North American take on the same pleasure.

ii. Why the ganache goes in frozen

The whole design depends on a race between the dough and the filling. In hot oil at around 170 °C, the outside of a doughnut sets and browns within a minute or so, while the inside reaches about 90–95 °C — hot enough to cook the dough through. Ganache sealed inside at room temperature would melt long before the dough was set, soak into the crumb and leak out through any weak seam. A frozen ball of ganache buys time: it stays solid while the dough rises and sets around it, and only melts fully in the last moments of frying and the first minutes out of the oil.

The ganache also needs the right ratio. A 2:1 ratio of chocolate to cream by weight is firm enough to roll into balls once chilled and freezes hard, but becomes a thick, glossy, pourable sauce when warm. A softer ganache leaks; a firmer one, or plain chocolate, stays grainy or solid in the centre.

Then the seal. The dough is wrapped around the frozen ball with no gaps and the seam pinched firmly, then turned seam-side down for the final rise. Any thin spot or trapped flour in the seam will open in the oil and let chocolate escape. The finished doughnuts are fried a little lower than usual — 170 °C rather than 180 °C — and a little longer, so the dough cooks right through around the cold centre without burning outside.

Last, timing. Once out of the oil, the ganache keeps melting for a few minutes and then, as the doughnut cools, slowly firms back to a soft truffle texture. For the full lava effect, eat them within about 15 minutes of frying, or rewarm them briefly.

iii. Ingredients

Makes 12 servings · scroll the side panel to adjust

• 160 g dark chocolate (55–70%), finely chopped, for the ganache
• 80 ml double cream
• 500 g strong white bread flour
• 60 g caster sugar
• 7 g instant yeast
• 8 g fine salt
• 220 ml whole milk, lukewarm
• 2 eggs
• 60 g unsalted butter, softened
• 1500 ml sunflower or rapeseed oil, for frying
• 100 g caster sugar, for coating
• 1 tbsp cocoa powder, for coating

Choose a dark chocolate of 55–70% for the ganache; it sets firmly enough to roll and gives a rich, not cloying, centre. Milk chocolate needs a 3:1 ratio of chocolate to cream to set. Strong bread flour gives a dough with enough gluten to stretch around the filling without tearing and to hold its shape in the oil. The doughnuts are finished in a cocoa sugar rather than a glaze, because they are eaten warm and glazes slide off hot dough; a simple dusting of icing sugar also works. For other fillings, freeze teaspoons of hazelnut spread, thick salted caramel or peanut butter on a lined tray.

iv. Method

1. Make the ganache: bring the cream just to a simmer, pour it over the chopped chocolate, leave for 2 minutes, then stir until smooth. Chill for 1 hour until firm, then roll into 12 balls of about 20 g each on a lined tray and freeze for at least 2 hours, until hard.
2. Mix the flour, sugar, yeast and salt. Add the warm milk and eggs and mix to a dough, then knead for 8–10 minutes, working in the butter a little at a time, until smooth and elastic. Cover and leave in a warm place for 1–1½ hours, until doubled.
3. Knock back the dough and divide it into 12 pieces of about 70 g. Flatten each into a 10 cm disc, place a frozen ganache ball in the centre, and draw the edges up around it. Pinch the seam very firmly closed, then roll gently under a cupped hand into a smooth ball.
4. Set the balls seam-side down on squares of floured baking paper, well spaced. Cover loosely and prove for 30–40 minutes, until puffy and nearly doubled. Work quickly so the ganache stays cold.
5. Heat the oil in a deep, heavy pan to 170 °C (340 °F). Fry 3 doughnuts at a time for 2–2½ minutes per side, until deep golden brown, keeping the oil temperature steady.
6. Drain on a rack lined with kitchen paper for 1 minute, then roll in the mixed caster sugar and cocoa.
7. Rest for 3–5 minutes so the centre finishes melting, then serve warm, breaking them open over a plate.

v. Tips & common mistakes

• Freeze the ganache solid. Soft filling melts during shaping and proving, soaks the dough and bursts out in the oil.
• Seal without flour in the seam. Flour stops the dough sticking to itself. Brush off excess and pinch hard; a weak seam is the most common source of leaks.
• Prove seam-side down. The weight of the dough helps seal the join as it rises.
• Fry at 170 °C, not hotter. A slightly cooler oil cooks the dough through around the cold centre; at 180 °C the outside darkens before the inside is done.
• Test one first. Fry and cut a single doughnut to check that the dough is cooked and the centre melted, then adjust time for the rest.
• Serve warm. The ganache sets back to a truffle-like centre as the doughnut cools; reheat for 10 seconds in a microwave to bring the lava back.

vi. Variations

Salted caramel lava donuts use frozen discs of thick caramel. Peanut butter lava donuts freeze balls of peanut butter mixed with a little icing sugar, then dust the doughnuts in sugar. White chocolate and matcha uses a 3:1 white-chocolate ganache flavoured with matcha. A baked lava doughnut can be made by baking the filled balls at 190 °C (375 °F) for 12–15 minutes, brushing with butter and rolling in sugar — more like a filled brioche bun.

For filled doughnuts made the classic way, see Germany's Berliner, and for American yeast doughnuts, the classic glazed donut. The Gulf's luqaimat are crisp fried dough balls in date syrup, and Korea's hotteok hide a molten brown-sugar centre in a pan-fried pancake.

vii. Serving & storage

Serve lava donuts warm, within 15 minutes of frying, on a plate rather than in the hand — the centre flows freely. A scoop of vanilla ice cream or a spoonful of crème fraîche turns them into a plated dessert, and a cup of strong coffee or hot chocolate is the natural partner.

They are best on the day. Leftovers keep in an airtight container at room temperature for 1 day; rewarm in a 160 °C oven for 5 minutes or a microwave for 10–15 seconds to melt the centre again. The ganache balls can be made and frozen up to a month ahead. Shaped, unproved doughnuts can be frozen on a tray, then bagged, for up to a month: thaw them in the fridge overnight, prove at room temperature, and fry as usual.

ix. More from North American

• Donuts — classic glazed yeast doughnuts
• Maple Bacon Donut — maple glaze and crisp bacon
• Cronut — croissant-doughnut hybrid
• Berliner — German jam doughnuts
• Hotteok — Korean molten-sugar pancakes
• Luqaimat — Emirati date-syrup dumplings