1 lg. can crushed pineapple
1 lb. dark brown sugar
1 stick butter
1 pkg. yellow cake mix

Mix cake according to directions. Set aside. Melt butter and pour into 9"x13" cake pan. Sprinkle dark brown sugar evenly over melted butter. Drain pineapple and spread into pan. Pour cake mix evenly over other ingredients in cake pan. Bake at 350 degrees until toothpick inserted in center comes out clean.