1. Heat oven to 425 degree F. Combine rhubarb, strawberries, sugar, cornstarch, and water in large saucepan. Bring to boil, stirring. Pour into 9-inch square or 2-1/2-quart shallow baking dish. Set aside.Make Topping::
2. Combine flour, 2 tablespoons sugar, baking powder, lemon peel, and salt in large bowl. With pastry blender or 2 knives, cut in butter until mixture resembles coarse crumbs. Stir in cream just until blended. On lightly floured surface, knead just until mixture holds together. Roll into 8-inch square or other shape 1 inch smaller than dish. Place on hot rhubarb mixture; sprinkle with remaining 1 tablespoon sugar.
3. Place dish on cookie sheet. Bake 22 to 25 minutes or until golden and bubbly. Makes 8 servings.