PREHEAT oven to 325°F. Beat egg whites in large bowl with electric mixer on medium speed until frothy. Add coconut, sugar, flour, white chocolate and lemon peel; stir until well blended.
DROP tablespoonfuls of batter, 2 inches apart, onto lightly greased and floured baking sheets.
BAKE 20 minutes or until edges of cookies are golden brown. Remove from baking sheets to wire racks; cool completely. Drizzle evenly with semi-sweet chocolate. Let stand until chocolate is firm.