Rosca de Reyes
1 lime, zested 1 orange, zested 1 pinch salt 1 tablespoon butter, softened 1 tablespoon warm water 2 (.25 ounce) packages dry yeast 20 candied citrus peels 3 eggs 3 eggs, separated 4 cups all-purpose flour ¼ cup all-purpose flour ¼ cup butter ½ cup butter, softened ½ cup white sugar ⅔ cup white sugar