PREHEAT oven to 425°F. Cut butter into flour in large bowl with pastry blender or 2 knives until mixture resembles coarse crumbs. Gradually add water, stirring with fork until well blended. Press firmly onto bottom of ungreased 9-inch square baking pan.
BAKE 20 minutes or until lightly browned. Reduce oven temperature to 350°F.
BEAT eggs in large bowl with electric mixer on high speed 1 minute. Gradually add sugar, beating until thickened and lemon coloured. Gently stir in coconut; set aside. Spread jam over crust to within 1/4 inch of edges. Carefully spread coconut mixture over jam. Continue baking 25 minutes or until golden brown. Cool completely. Cut into 15 bars to serve.