Put the flour, ½ cup sugar and the salt in a mixing bowl and blend well. With a pastry blender, cut in the ½ cup butter or margarine until the particles are quite fine. Add 1 lightly beaten egg and toss to mix. Gather the mixture together, working quickly with your hands to form a dough. Press the mixture evenly on the bottom of a lightly buttered 10x15-inch pan. Spread the jam on top.

Cream the softened butter or margarine with the remaining 1 cup sugar. Add the remaining 3 eggs one at a time, beating after each addition. Beat until light and creamy. Add the coconut and mix well. Spread over the jam layer. Bake at 350 degrees F for 20 to 25 minutes or until golden brown. Cool the pan on a rack. Cut in squares.