Mousse de Açaí com Tapioca

Ingredients

Equipment Needed

• •2-liter saucepan
• •Fine-mesh sieve
• •Blender
• •Hand mixer or sturdy balloon whisk
• •Flexible spatula
• •6 small 150-ml glasses

Instructions

1. 1

   Read the labels

   Buy unsweetened polpa de açaí, preferably grosso. Médio works and is usually cheaper, but the mousse will be a little softer. Fino is thinner and less intense, so use it only if that's what you can get and add 1 extra teaspoon gelatin. Leave the packs in the fridge until they're cold and pourable, not warm. Warm açaí loses its clean fruit taste and makes the cream slump.

   Polpa de cupuaçu is tart and creamy. Polpa de bacuri is pale, perfumed, and completely different. Both are good, both are not açaí. For the topping, buy small tapioca pearls or sagu de tapioca, not farinha de tapioca, farinha d'água, or farinha seca. Those flours belong to other plates.
2. 2

   Cook the pearls

   Bring 3 cups water to a boil in a 2-liter saucepan. Stir in the tapioca pearls and a tiny pinch of the salt, then lower to a lively simmer. Stir for the first minute so they don't clump at the bottom. Cook until most pearls turn translucent with only a small white dot in the center, 12 to 18 minutes. The dot finishes softening as they cool, and if you chase perfect transparency in the pot you'll end up with paste.

3. 3

   Rinse and dress

   Drain the pearls in a fine-mesh sieve and rinse under cold water until they feel slippery and separate. Rinsing removes the loose surface starch, which is the difference between a glossy topping and a glue cap. Return the pearls to the pan with the coconut milk, sugar, and another tiny pinch of salt. Warm over low heat for 2 minutes, just until shiny and lightly sweet. Cool completely.

4. 4

   Bloom the gelatin

   Sprinkle the gelatin over 3 tablespoons cold water in a small cup and let it sit for 5 minutes, until it looks swollen and matte. Melt it gently in short microwave bursts or over a pan of hot water until clear. Don't boil it. Gelatin is structure, not flavor, and boiling weakens the set.

5. 5

   Blend the base

   Put the cold pourable açaí pulp, condensed milk, lime juice if using, and the last tiny pinch of salt in a blender. Blend just until smooth and dark, about 20 seconds. Taste it. It should be earthy, lightly sweet, and bright enough that the cream won't flatten it. If your açaí is very bitter, add condensed milk 1 tablespoon at a time. You decide the sweetness, not a pre-sweetened purple syrup.

6. 6

   Whip the cream

   Whip the cold cream in a chilled bowl until it holds soft peaks, the kind that bend over at the tip instead of standing stiff. Stop there. Soft cream folds into the açaí and gives the mousse air; overwhipped cream turns grainy and heavy, and then you wonder why dessert feels like work.

7. 7

   Temper and fold

   Stir 1/2 cup of the açaí base into the melted gelatin until smooth, then stir that mixture back into the rest of the açaí. This keeps the gelatin from setting into strings when it hits the cold fruit. Add the açaí base to the whipped cream in two additions, folding with a spatula until no pale streaks remain. Fold from the bottom and turn the bowl, because the air you keep now is the softness you eat later.

8. 8

   Chill to set

   Divide the mousse among 6 small glasses, about 150 ml each. Tap each glass once on the counter to settle big air pockets, then chill uncovered for 30 minutes. Cover and chill until set, at least 4 hours. The mousse should wobble gently when you move the glass and hold a spoon mark on the surface.

9. 9

   Top and serve

   Spoon the cooled tapioca pearls over the set mousse just before serving, or up to 8 hours ahead if the glasses will stay covered and cold. The pearls should look glossy and separate, not dry. Serve cold, straight from the fridge, while the glass has a little condensation and the mousse is firm enough to scoop cleanly.

Chef Tips

• •Açaí grosso has more body and deeper flavor, so it makes the best mousse. Médio works for a Tuesday and costs less, but the set is softer. Fino is the honest compromise, not a disaster, just add 1 extra teaspoon gelatin and expect a milder glass.
• •Skip açaí mousse mix, sweetened açaí dessert powder, and pre-sweetened blends with guaraná syrup. Some shortcuts save time. Those sell you imitation flavor and then ask you to call it cooking.
• •Farinha d'água is the crunchy cassava meal paraenses eat with savory açaí. Farinha seca is finer and drier. Farinha de tapioca is flaked or granulated cassava starch. None of them are the little pearls for this topping. Read the bag once and you'll never be bullied by that shelf again.
• •Cupuaçu and bacuri are not backup açaí. Cupuaçu is sharp and creamy; bacuri is fragrant and pale. Use them proudly in their own mousses, not as costume changes for this one.
• •Condensed milk belongs here as dessert sweetness, not as a factory shortcut for the fruit. Start with 1/2 cup, taste, and adjust. The açaí should still taste like açaí.
• •Cooked tapioca pearls firm up in the fridge. If they get stiff, loosen them with 1 or 2 teaspoons coconut milk and stir gently before topping the mousse.

Advance Preparation

• •Thaw the açaí packs overnight in the fridge until cold and pourable. Don't thaw them on the counter until warm.
• •The mousse can be made 1 day ahead. Cover after the first 30 minutes of chilling so the surface stays clean.
• •The tapioca pearls are best the day they're made, but they can be cooked and held in the coconut milk mixture for up to 24 hours in the fridge.
• •Don't freeze the finished mousse. The cream and gelatin weep when thawed, and the texture turns watery.

Frequently Asked Questions

Nutrition Information

1 serving (about 180g)