Brazilian bolo de cenoura is not usually a grated-carrot cake. The carrots go into the blender with the eggs and oil, which gives the crumb its bright color and smooth texture. A glossy brigadeiro topping makes it a familiar snack-table favorite, but the cake is just as useful to know how to make plain, when you want something less sweet.
Blend for a fine crumb
For one cake baked in a greased 23 cm (9-inch) pan, you’ll need 250 g peeled carrot cut into small pieces, 3 eggs, ¾ cup (180 ml) neutral oil, 1½ cups (300 g) sugar, 2 cups (250 g) all-purpose flour, and 1 tablespoon baking powder. Blend the carrot, eggs, oil, and sugar until no visible carrot pieces remain. This matters: large chunks can weigh down the batter and leave uneven patches in the finished cake.
Pour the blended mixture into a bowl and fold in the flour in two additions, stopping as soon as it is incorporated. Mix in the baking powder last, gently, so the batter does not lose its lift. Bake at 180°C (350°F) for about 35–45 minutes, until a skewer inserted in the center comes out clean or with a few dry crumbs.
Make a soft brigadeiro topping
While the cake cools, combine 1 can (395 g) sweetened condensed milk, 2 tablespoons cocoa powder, and 1 tablespoon butter in a saucepan. Stir over low to medium-low heat until the mixture thickens enough to coat a spoon but still falls in a ribbon; this usually takes several minutes. Pour it over the cooled cake while it is still spreadable.
For a less sweet finish, use dark cocoa and spread a thinner layer. If cocoa powder is not available, chocolate powder can work, though many blends contain added sugar, so the topping will taste sweeter and may thicken differently. Keep stirring and scrape the corners of the pan; condensed milk catches quickly if the heat is too high.
Keep slices tender
Let the cake cool before adding the topping, or the warm crumb can absorb too much of it. Keep covered at room temperature for up to two days, or refrigerate for up to five days, where the topping will firm. For a softer slice from the refrigerator, let it sit at room temperature briefly before serving.
You can bake the cake a day ahead and add the brigadeiro closer to serving. If the topping becomes too firm in the pan, warm it gently and stir in a spoonful of milk until it spreads again. Why did the cake turn out heavy? The most common causes are carrots that were not fully blended, overmixing after adding the flour, or measuring too much flour; spoon it into the measuring cup and level the top rather than packing it down.