Cream 2 sticks butter with 2 cups sugar. Add 4 eggs, one at a time, beat well. Add 1 (16 oz.) can Hershey's syrup. Sift 2 1/2 cups flour with 1/2 teaspoon soda, 1/4 teaspoon salt. Add to creamed mixture. Add 1 cup buttermilk, then add 1 teaspoon red food coloring, 1 teaspoon vanilla and last 1 large (8 oz.) Hershey's candy bar, softened. Beat well and bake in a greased and floured tube pan at 325 degrees for 1 1/2 hours.