Soursop pulp blended with milk or water, sweetened to taste. Guanábana is a large green tropical fruit with soft white flesh that tastes somewhere between pineapple and cream. Made with milk it becomes almost a milkshake; with water it stays light. Three ingredients, ten minutes, serves three.
The seeds are the one thing to be careful with: they contain annonacin and are not edible, so pick them all out and never blend them. The flesh is the part that gets eaten, and it always has been. Soursop bruises easily and goes over within a day or two of ripening, which is why frozen pulp is the practical option outside the tropics and why it is sold that way in Latin groceries. Ripe fruit gives slightly under thumb pressure, like an avocado, and the spines soften and darken. With milk this becomes close to a milkshake; with water it is a lighter, more refreshing drink.