Potato and Caramelized Onion Stuffed Dumplings {Vareniki}

INGREDIENTS

white potatoes (peeled and cut into quarters or eighths)

Water for boiling

1 1/2 sticks

butter (3/4 cup)

1/2 cup

caramelized onions

Salt

5 cups

all-purpose flour

1 cup

water

eggs

1 stick

butter (softened to room temperature)

1 tsp

salt

batch caramelized onion mashed potatoes

Optional: 4 tablespoons butter for frying (sour cream, and chopped chives for serving.)