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1
Preheat the oven to 350 degrees F (175 degrees C). Grease an 8x8 inch square baking dish.
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2
In a medium bowl, cream together the butter and 1/4 cup sugar until smooth. Beat in the egg and vanilla. Combine the flour, baking powder and salt; stir into the butter mixture until a stiff dough forms. Press the dough into the bottom and 1/2 inch up the sides of the prepared pan.
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3
Bake crust for 15 minutes, or until firm.
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4
In a saucepan over medium heat, combine the rhubarb, 1/2 cup sugar, cinnamon, and 3 tablespoons water. Bring to a boil, and cook until rhubarb is tender, about 10 minutes. Mix remaining 2 tablespoons of water with the cornstarch, and stir into the saucepan. Cook, stirring constantly, until the sauce is thickened. Remove from heat, and spread over the baked crust.
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5
In a medium glass or metal bowl, beat egg whites until soft peaks form. Gradually add remaining 1/2 cup of sugar, continuing to beat until whites form stiff peaks. Spread meringue over the layer of rhubarb sauce, and sprinkle coconut over the top.
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6
Bake for 10 minutes in the preheated oven, or until the meringue is golden brown. Cool completely before cutting into squares.
