Banh Chuoi — Vietnamese baked banana cake

i. Origin & history

Bananas grow everywhere in Vietnam, and chuối appear in dozens of sweets: grilled in sticky rice, stewed in coconut milk in chè chuối, fried in batter, or dried in the sun. Bánh is a broad word for cakes, breads and many snacks, so bánh chuối means simply 'banana cake' and refers to several distinct preparations rather than one fixed recipe.

The baked version, bánh chuối nướng (nướng means baked or grilled), is a thrifty home dessert, particularly associated with southern Vietnam. It uses up two things that are always going stale or overripe in a Vietnamese kitchen: bananas that have gone soft and spotty, and leftover bread. The bread is the French part of the story. Wheat bread arrived with French colonial rule from the nineteenth century, and the bánh mì baguette became a staple; day-old baguette soaked in coconut milk and mashed bananas is the Vietnamese answer to the French and British bread pudding.

The steamed version, bánh chuối hấp, is older in spirit and contains no wheat at all: banana slices bound with tapioca starch and coconut milk, steamed until glossy and chewy, and often tinted pink or yellow. It is closer to the other steamed starch cakes of the region, such as bánh da lợn.

Both are sold at markets and street stalls, cut into squares, and both are almost always eaten with nước cốt dừa — a warm, lightly salted coconut cream thickened with a little starch — and a sprinkle of toasted sesame or crushed peanuts. That sauce is what makes the cake unmistakably Vietnamese.

ii. Why the bananas must be almost black

The single most important ingredient decision is ripeness. As a banana ripens, enzymes convert its starch into sugars, and the flesh softens as pectin breaks down. A banana with a heavily speckled or blackened skin is far sweeter and more aromatic than a yellow one, and it collapses into a syrupy purée when baked. Yellow bananas stay starchy and firm and give a bland, pasty cake.

The bread acts as a sponge and a scaffold. Day-old baguette is ideal because it is dry enough to absorb the coconut milk without disintegrating, and its open crumb drinks up liquid evenly. Soaking it for at least 20 minutes, and squeezing and mashing it into the banana, is what gives bánh chuối nướng its smooth, custardy body rather than a bread pudding with distinct cubes.

The eggs and a little melted butter bind everything into a set custard. Too much egg makes the cake rubbery and quiche-like; this recipe uses just enough to hold a clean slice once it has cooled.

The top is where the flavour concentrates. A layer of banana slices pressed into the surface, brushed with butter and sprinkled with sugar, caramelises in the oven into a sticky, deep-gold lid. Many cooks also caramelise sugar in the tin first, which gives a darker, slightly bitter base in the manner of a flan.

iii. Ingredients

Makes 9 servings · scroll the side panel to adjust

• 7 very ripe bananas (about 800 g peeled)
• 200 g day-old baguette or white bread, torn into pieces
• 400 ml full-fat coconut milk
• 100 ml whole milk
• 120 g sugar, plus 2 tbsp for the top
• 3 eggs
• 60 g unsalted butter, melted
• 1 tsp vanilla extract
• ½ tsp fine salt
• 200 ml coconut cream, for the sauce
• 2 tbsp sugar, for the sauce
• 2 tsp tapioca starch or cornflour, for the sauce
• ¼ tsp salt, for the sauce
• 1 tbsp toasted sesame seeds or crushed roasted peanuts

Bananas are the key. In Vietnam the small, sweet chuối sứ (a type similar to the Thai namwa) is used; ordinary Cavendish bananas work if they are heavily speckled. Stale baguette gives the best texture; sliced sandwich bread works but turns softer and gummier, so reduce the milk by 50 ml. Full-fat coconut milk is non-negotiable for flavour. The salt in both the cake and the sauce matters: Vietnamese coconut desserts are always seasoned, and the saltiness of the sauce is what keeps the very sweet cake balanced. To make it dairy-free, replace the milk with more coconut milk and the butter with coconut oil.

iv. Method

1. Put the torn bread in a large bowl, pour over the coconut milk and whole milk, and leave to soak for 20–30 minutes, pressing it down occasionally, until completely soft.
2. Heat the oven to 180 °C (350 °F), 160 °C fan. Butter a 20–22 cm square baking tin and line the base with baking paper.
3. Slice 2 of the bananas lengthways into thin strips and set aside for the top. Mash the remaining bananas roughly with a fork — some small lumps are good.
4. Squeeze and mash the soaked bread with your hands or a whisk until it is a coarse paste. Beat in the eggs, 120 g sugar, most of the melted butter, the vanilla and the salt, then fold in the mashed banana.
5. Pour into the tin and level. Lay the reserved banana strips over the surface, brush them with the remaining butter and sprinkle with the 2 tbsp sugar.
6. Bake for 60–75 minutes, until the cake is firm in the centre, the edges have pulled slightly away from the tin and the top is a deep caramel brown. If it browns too quickly, cover loosely with foil after 45 minutes.
7. Leave to cool in the tin for at least 1 hour; it firms considerably as it cools and will not cut cleanly while hot.
8. For the sauce, whisk the coconut cream, sugar, starch and salt in a small pan. Heat gently, stirring, until it just simmers and thickens to a pouring-cream consistency, about 3 minutes. Do not boil hard or it may split.
9. Cut the cake into squares, spoon over the warm coconut sauce and scatter with sesame seeds or peanuts.

v. Tips & common mistakes

• Wait for black-spotted bananas. Yellow bananas give a starchy, flat-tasting cake. If yours are not ready, roast them in their skins at 180 °C for 15 minutes until black; they soften and sweeten.
• Soak the bread fully. Dry centres in the bread show up as white, chewy lumps in the finished cake. The bread should be completely soft before you mash it.
• Bake it longer than you expect. With so much fruit and liquid, an underbaked bánh chuối is wet and gluey in the middle. The centre should feel firm, not wobbly, when pressed.
• Cool before cutting. Hot from the oven it is closer to a pudding; after an hour it slices into neat squares with a dense, sticky crumb.
• Season the coconut sauce. A pinch of salt turns it from flat and milky to rich and savoury-sweet, which is how it is served in Vietnam.
• Use a metal tin for a better crust. A metal tin conducts heat better than glass or ceramic and gives the caramelised edges that many people consider the best part.

vi. Variations

Bánh chuối hấp is the steamed version: sliced banana mixed with tapioca starch, sugar and coconut milk, steamed until translucent and chewy, and often coloured pink. Bánh chuối chiên is battered fried banana, a street snack. Some cooks make bánh chuối nướng with caramel, pouring a dark sugar caramel into the tin first and turning the cake out like a flan. Others replace the bread with sponge cake crumbs or a simple batter of flour and eggs for a lighter result. Across the region, bananas get similar treatment in the Filipino turon and banana cue, and in the Indonesian baked banana fritters. For another coconut-sauced Vietnamese sweet, try chè ba màu.

vii. Serving & storage

Bánh chuối nướng is eaten warm or at room temperature, cut into squares, as an afternoon snack with tea or iced coffee, or as a dessert after a family meal. The warm coconut sauce and sesame seeds are the traditional finish; in hot weather some people eat it chilled with cold sauce.

Keep the cake covered in the fridge for up to 3 days; it actually firms and slices better on the second day. Warm squares for 20–30 seconds in the microwave or 10 minutes in a low oven before serving. The sauce keeps for 3 days in the fridge and thickens as it cools; loosen it with a splash of water when you reheat it. The cake freezes well in individual squares for up to a month.

ix. More from Vietnamese

• Banh Da Lon — Vietnamese layered steamed cake
• Che Ba Mau — three-colour dessert drink
• Turon — Filipino banana spring rolls
• Banana Cue — caramelised skewered bananas
• Baked Banana Fritters — Indonesian oven-baked banana
• Zucchini Bread Pudding — a savoury-sweet bread pudding cousin