Beat the egg whites with the sugar until stiff peaks form. In a separate bowl, mix together the flour, baking powder, and cocoa powder.

Add the flour mixture to the beaten egg whites one tablespoon at a time, mixing gently. Add the milk and orange paste, and continue mixing until you have a smooth batter.

If the batter is too thick, add a little more milk.

Stack the pancakes on a plate, dust with powdered sugar, and serve.