In a large pot of boiling water, cook pierogies according to package directions.
Meanwhile, in a large skillet over medium heat, cook bacon until crisp; drain and crumble; set aside.
Discard all but 3 tablespoons of the drippings from the skillet, place skillet over medium heat. Heat bacon fat. Add onion; cook and stir until lightly browned, 4 to 5 minutes; remove from heat. Stir in vinegar, sugar and pepper.
Place drained pierogies in a large bowl; add onion mixture and bacon; toss gently. Serve warm on a bed of mixed greens, if desired, as an appetizer, an accompaniment to poultry or pork or with a chicken or tuna salad sandwich.
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