To that add the Strawberries, Pineapple, Bananas, and Walnuts. Mix well. Pour mixture in a large pan and place pan in the refrigerator until half way set about 1 hour. Time can be shortened if you want to put in the freezer for 1/2 hour. Don't use a glass dish if you use the freezer method. Also, keep checking on it you don't want it to freeze!