INGREDIENTS
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1/2 cup butter
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1 cup brown sugar
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1 egg
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1 tsp vanilla
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1 cup milk
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1 tbsp vinegar
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1/2 tsp salt
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2 cups flour
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1 tsp baking soda
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1/2 tsp cinnamon
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2 1/2 cups finely chopped rhubarb
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Topping...
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1/3 cup brown sugar
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1/2 tsp cinnamon
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1/2 cup coconut (optional)