Separate the egg, set the egg whites aside. Mix the margarine, sugar, lime juice and egg yolks together until frothy. Add 75g desiccated coconut, flour, cornstarch and cayenne pepper and knead everything with your hands to form a smooth dough. Cover the dough in the refrigerator for 10 minutes.
Preheat the oven to 175 ° C.
Whisk the egg whites with a whisk. Shape the dough into about 30 balls with a diameter of about 2 cm. Roll the dough balls first in the egg white, then in the remaining desiccated coconut and place on a baking sheet lined with baking paper. Bake in the oven (center, fan oven 160 ° C) for about 12-15 minutes.