Autumn Fruit Salad

I saw this recipe last year in a Taste of Home magazine I bought.  I finally got around to trying it out, and it was a fun mix of some of my favorite flavors. 
Ingredients:  1 1/2 c. sugar, 1/2 c. all-purpose flour, 1 1/2 c. water, 1 t. butter, 1 t. vanilla, 5 c. cubed, unpeeled green apples, 2 c. halved red seedless grapes, 1 c. diced celery, 1 c. walnut halves. 
Instructions:  In a large saucepan, combine sugar, flour, and water.  Mix and bring to a boil.  Cook until the mix thickens, this happens quickly, and when it does, it looks like this. 

Let the mix cool, and add the fruits, nut, and celery to a large bowl.  When the mix is cooled, pour it over your bowl of diced fruits and goodies.  Toss, and refrigerate until serving.  This make a lot.  I think it would easily serve 8-10.