Ingredients
- 3 cups diced fresh rhubarb
 - 1 tablespoon all-purpose flour
 - 1/2 cup white sugar
 - 1 tablespoon water
 - 1 teaspoon ground cinnamon
 - 1 teaspoon ground allspice (optional)
 - 1 cup rolled oats
 - 1 cup brown sugar (packed)
 - 1/2 cup all-purpose flour
 - 1/2 cup butter
 
Directions
Preheat oven to 350 degrees F (175 degrees C). Grease an 8-inch square baking dish.
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        Mix rhubarb, 1 tablespoon flour, sugar, water, cinnamon, and allspice together in a bowl. Mix oats, brown sugar, and 1/2 cup flour together in a separate bowl; add butter and mash into the oats mixture with a pastry cutter until crumbly.
Press about half the oats mixture into the bottom of the prepared baking dish. Spread rhubarb mixture over the oats mixture; top with remaining oats mixture.
Bake in preheated oven until rhubarb layer is set, about 45 minutes.
