Place rhubarb in a greased 8-in. square baking pan. In a small bowl, mix flour, sugar, milk, butter, baking powder, salt and vanilla (mixture will be stiff). Spread over rhubarb. For topping, combine sugar and cornstarch. Sprinkle over dough. Pour water over all; do not stir. Sprinkle cinnamon on top. Bake at 350° for 55-65 minutes or until pudding tests done.
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