"Plum vareniki are quite a treat; sweet inside and out. This was my favorite food growing up and it always brings back sweet memories...."
INGREDIENTS
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1/3 cup buttermilk
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1/2 Tbsp sour cream
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1 cup warm water
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1 large egg
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1 tsp salt
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3 1/2 cups plus 3 Tbsp all-purpose (unbleached flour)
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1 lb sweet plums (thinly sliced)
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1/2 cup sugar