Beat the eggs with sugar and salt until fluffy for about 5-10 minutes. Add softened butter (you can mix vegetable and butter in equal proportions)
Add to the bulk of the cream and mix.
Mix the sifted flour, baking powder, and zest. Mix the “liquid” and “dry” parts. Mix on a slow mixer speed or with a silicone spatula until smooth.
Leave it on for forty minutes or longer. You can leave it overnight.
Spread out in paper capsules enclosed in prepared cupcake molds, and fill them with dough no more than 2/3, sprinkle with sugar. Bake first at a high temperature (220 degrees) for about 10 minutes, then at a temperature of 190 degrees until ready.