Freeze fruit overnight. Use a hand frother to froth either the milk or the aquafaba - room temperature liquid from an unsalted chickpea can - into a foam. About 1 minute. Set aside.
Make smoothie
Add all ingredients to the blender except for the frothed liquid and process until smooth. Pour the blended smoothie into a glass.
2 cups mango, frozen, 1 cup pineapple, frozen, ½ cup milk, 2 teaspoon lemon juice
Add the frothed liquid and drink immediately.
¼ cup aquafaba or more milk
Storage
Store smoothie in a mason jar with lid overnight in refrigerator or freeze in an ice cube tray to blend again when convenient.
Notes
Swap the aquafaba for more milk.Swap the pineapple for any other frozen fruit of a lighter color, such as frozen pears (not peeled), even a frozen banana, although paired with mango might produce a too-sweet smoothie.Swap the milk for a dairy-free but unsweetened yogurt, or chilled coconut water.Add protein and omegas by adding 1 tablespoon of chia seeds.