1 c. brown sugar
3/4 c. oats
1 c. flour
1/2 c. melted butter
1 tsp. cinnamon
4 c. uncooked cut up rhubarb
1 c. white sugar
2 tbsp. corn starch
1 c. water
1 tsp. vanilla

Mix brown sugar, oats, flour, melted butter and cinnamon until crumbly. Press 1/2 of mixture into a 9 inch square pan. Cover crumb mixture with cut up rhubarb. Mix white sugar, cornstarch and water. Cook until clear and thick, stirring constantly. Add vanilla and stir. Pour over rhubarb. Sprinkle with remaining crumb mixture over the top. Bake for 1 hour at 350 degrees.