How To make Pierogi with Caramelized Onions & Red Peppers

1 16 ounce package frozen
Low-fat potato and cheddar Pierogi Salt 2 md Red peppers
1 lg Onion (1 lb)
2 tb Salad oil
2 ts Sugar
2 ts Red wine vinegar
1/4 ts Coarsely ground black pepper
1 ts All-purpose flour
Parsley springs for garnish About 30 minutes before serving: In saucepot, prepare pierogi as directed for boiling, using 1 tablespoon salt in water; drain. Meanwhile, thinly slice red peppers and onion. In nonstick 12-inch skillet over medium high heat, in hot salad oil, cook onion 5 minutes. Add red peppers, sugar, vinegar, black pepper and 1/2 teaspoon salt; cook about 10 minutes longer, stirring occasionally, until vegetables are browned and tender. In 1-cup measuring cup, stir flour with 3/4 cup of water until blended; stir into vegetables in skillet; cook 1 minute. Divide pierogi among 3 dinner plates. Spoon pepper mixture over pierogi. Garnish with parsley if you like.