Plum Torte
["1/4 c. unsalted butter", "3/4 c. sugar", "2 ripe medium bananas, broken into chunks", "1 c. unbleached flour, sifted", "1 tsp. baking powder", "1/2 c. egg substitute or 2 whole eggs", "12 ripe prune plums, halved and pitted", "1/2 lemon", "1 tsp. cinnamon or to taste", "2 tsp. sugar or to taste"]
["Note:", "Blueberries, sliced peeled peaches, apples or combinations may be used on top."]
["unsalted butter", "sugar", "bananas", "unbleached flour", "baking powder", "egg substitute", "lemon", "cinnamon", "sugar"]