PREHEAT oven to 350°F. Mix wafer crumbs, 1/4 cup of the sugar, the margarine and lemon peel until well blended. Press evenly into 8-inch square baking pan. Bake 8 minutes.
BEAT eggs and the remaining 3/4 cup sugar in small bowl until thickened. Add lemon juice, flour, baking powder and salt; mix well. Pour over crust; sprinkle with coconut.
BAKE 25 to 30 minutes or until centre is set and top is lightly browned. Cool completely. Cover and refrigerate several hours or until chilled. Cut into 20 squares to serve. Store in airtight container in refrigerator.