Melt chocolate, egg yolk, orange zest and melted butter.
Beat egg whites into snow. Stir the sugar into the chocolate mixture.
Mix the egg whites with the chocolate mixture until smooth.
Butter 20 cups or soufflé dishes. Then cut strips of baking paper at the height of the shapes and line the shapes with them. Also rings for the floor. Then pour in the mixture and place a sweet truffle or praline in the middle and freeze for 12-24 hours
Bake at 200 ° for 15-18 minutes.
Turn out, sprinkle with powdered sugar and serve with white chocolate ice cream or orange compote.