Mix 1/2 cup margarine and sugar. Stir in egg yolks, almond extract and flour. Press evenly into tiny tart tins or muffin cups. Bake in 400 degree oven for 8 to 10 minutes.
Bring to boil 1/2 cup margarine, corn syrup and confectioner's sugar. Stir in chopped pecans; spoon into baked shells. Top with pecan halves.
Bake in 350 degree oven for 5 minutes. Makes 4 dozen.