1 cup sifted flour
3/4 cup oatmeal (uncooked)
1 cup brown sugar, firmly packed
1/2 cup melted butter
1 teaspoon cinnamon
1/4 teaspoon ginger
4 cups diced rhubarb

Mix the above ingredients until crumbly (except rhubarb). Press half of the crumbs into a greased 9-inch square baking pan. Cover with the diced rhubarb.

1 cup sugar
2 tablespoons cornstarch
1 cup water
1 teaspoon vanilla

Combine these and cook until thick and clear. Pour over rhubarb. Top with remaining crumbs.

Bake in moderate oven 350°F for 60 minutes. Cut into squares and serve warm, plain or with whipped cream.