INGREDIENTS
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*If using frozen rhubarb for this pie, thaw the rhubarb in a sieve over a bowl, and discard the excess liquid.
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pastry for single-crust pie
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1 1/2 cups brown sugar, packed
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1/3 cup water (leave this out if using frozen rhubarb, thawed)
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6 1/2 tbsp. cornstarch
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4 1/2 cups chopped fresh or *frozen chopped rhubarb
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FOR THE TOPPING
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1 cup oats
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1/2 cup brown sugar, packed
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1/4 cup cold butter
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2 tbsp. all-purpose flour