01 -
Bring a large stock pot of salted water to a boil. Add pierogies and return to a boil. Cook for 3 minutes, then drain and set aside.
02 -
Melt 2 tablespoons of butter in a 12-inch skillet over medium-high heat. Add the sliced kielbasa, turning frequently until evenly browned. Remove kielbasa from skillet and set aside.
03 -
Add remaining 3 tablespoons of butter to the empty skillet. Add coarsely chopped onion and sauté until softened and lightly golden.
04 -
Return pierogies and browned kielbasa to the skillet. Stir until well coated in butter and heated through. Serve warm.