Drain pineapple; reserve ¾ c. liquid. Combine dry ingredients in heavy saucepan; add pineapple liquid. Cook, stirring constantly, until thickened. Remove from heat; stir in lemon juice and set aside.
Layer fruit, crumbs and cheese in buttered 2-qt. casserole. (Pour on sauce before adding last layer of crumbs and cheese.) Cover; bake in moderate oven (350°) about