Bolo de Cupuaçu

Ingredients

Equipment Needed

• •23 cm (9 inch) round cake pan
• •Large mixing bowl
• •Medium mixing bowl
• •Whisk
• •Rubber spatula
• •Small saucepan for the optional calda
• •Wire rack

Instructions

1. 1

   Read the polpa

   Check the package before the bowl comes out: it should say polpa de cupuaçu, unsweetened, not drink mix, not powdered flavor, and not polpa de bacuri. Thaw the pulp in the fridge overnight or in a bowl of cool water, then stir it smooth. It should smell tart and full, like real fruit. Sweetened pulp changes the sugar and moisture; powder gives aroma without fruit, and a gente is making food, not a scented candle.

   If the only cupuaçu you can find is already sweetened, use it on another day for a quick dessert sauce. For this cake, unsweetened pulp keeps the crumb and sweetness under your control.
2. 2

   Prepare the pan

   Heat the oven to 180°C (350°F). Grease a 23 cm (9 inch) round cake pan and dust it with flour, tapping out the extra. Whisk the flour, baking powder, and salt in a bowl until the baking powder disappears into the flour. That even mix keeps one corner from rising like a hill while another sits there sulking.

3. 3

   Beat eggs and sugar

   Put the eggs and sugar in a large bowl and whisk for 1 to 2 minutes, until the mixture looks paler, a little foamy, and less sandy under the whisk. This is not fancy work; it dissolves some sugar and traps a little air so the cake bakes tender instead of heavy.

4. 4

   Add pulp and milk

   Whisk in the oil in a thin stream, then whisk in the cupuaçu pulp and milk. The mixture may look slightly split because cupuaçu is acidic. Don't panic. It comes together once the flour goes in. Oil keeps the crumb soft after it cools, and the pulp needs to spread evenly or some bites taste like plain cake pretending.

5. 5

   Fold the batter

   Add the flour mixture in two additions, folding with a spatula after each one just until no dry streaks remain. The batter should be thick, pourable, and pale yellow. Stop there. Work flour too long and it builds chew, lovely in bread, rude in cake.

   Once flour enters, put the whisk down. A spatula is slower, yes, and that's why it saves the cake from becoming tough.
6. 6

   Bake until cracked

   Pour the batter into the prepared pan and smooth the top. Bake for 35 to 42 minutes, opening the oven only after 30 minutes, until the top is golden with small cracks, the edges pull slightly from the pan, and a toothpick comes out with moist crumbs but no wet batter. Open too early and the middle can sink; pull it too soon and the crumb stays gummy.

7. 7

   Make the calda

   While the cake rests, make the optional calda. Put the cupuaçu pulp, sugar, water, and pinch of salt in a small saucepan over medium heat. Stir until it simmers, then cook 5 to 7 minutes, until glossy and thick enough that a spoon dragged through the pan leaves a line for a second. This cooks off the raw sharp edge and makes the fruit cling to the cake instead of running straight through it.

   The calda is optional. Skip it and the cake still works, especially with coffee. Keep cooking it until sticky candy and you'll lose the clean tartness, so stop when it shines and lightly coats the spoon.
8. 8

   Rest and serve

   Let the cake rest in the pan for 10 to 15 minutes, then run a thin knife around the edge and turn it out onto a plate or rack. Spoon the calda over the top or serve it on the side. Wait at least 20 minutes before slicing so the crumb sets. Cut too hot and it smears under the knife, and then you'll blame yourself instead of the clock.

Chef Tips

• •Fresh cupuaçu is best when it's local, in season, cheap, and smelling alive. Outside the north, frozen unsweetened pulp is the honest shortcut; it costs you a little fresh aroma, not the soul of the cake.
• •Read the freezer aisle like a cook. Açaí grosso, médio, and fino are açaí concentrations, and the savory northern açaí carried by Indigenous and ribeirinho foodways is not the same dish as the sweet bowl that spread from Rio. For this cake, reach for polpa de cupuaçu, not açaí, not bacuri.
• •The same label habit saves you elsewhere: farinha d'água is coarse and belongs beside fish and açaí in the north, farinha seca is drier and finer, tapioca pearls are little balls for pudding, and farinha de tapioca is granulated cassava for soaking into cakes and porridges. Don't let one shelf of white cassava things bully you.
• •Do not replace the pulp with powdered cupuaçu flavor. Some shortcuts save a Tuesday. This one removes the fruit and leaves you with perfume. Make a lemon cake instead and sleep with a clean conscience.
• •If your batter looks a little curdled after the pulp goes in, keep going. Cupuaçu is acidic and dramatic. The flour calms it down, which is more than I can say for some people.
• •This cake keeps well because of the oil. Store it covered at room temperature for 2 days or in the fridge for 4 days. Bring chilled slices back to room temperature before serving, because cold cake tastes quieter.

Advance Preparation

• •Thaw the frozen cupuaçu pulp overnight in the fridge, or place the sealed packet in a bowl of cool water for 20 to 30 minutes.
• •The cake can be baked 1 day ahead. Let it cool completely, wrap it well, and keep it at room temperature.
• •The optional calda can be made up to 3 days ahead and kept in the fridge. Warm it gently or let it come to room temperature before spooning over the cake.
• •Freeze individual slices, well wrapped, for up to 2 months. Thaw at room temperature and serve with coffee.

Frequently Asked Questions

Nutrition Information

1 serving (about 105g)