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From about.com

Ingredients:

• 1 cup light brown sugar, firmly packed
• 1 cup all-purpose flour
• 3/4 cup quick cooking rolled oats
• 1/2 cup melted butter
• 1 teaspoon cinnamon
• 4 cups sliced rhubarb
• 1 cup granulated sugar
• 2 tablespoons cornstarch
• 1 cup water
• 1 teaspoon vanilla

Preparation:

1. Preheat oven to 350F
2. In mixing bowl, combine brown sugar, flour, oats, butter and cinnamon; mix together until crumbly. Press half of the brown sugar and oats mixture into a buttered 8-inch square baking dish. Top with the sliced rhubarb.
3. In a saucepan combine 1 cup granulated sugar, cornstarch, and the 1 cup of water and vanilla. Cook together until clear, then pour over rhubarb.
4. Top rhubarb with remaining crumb mixture and bake at 350F for 45 to 55 minutes.