Butter & Onion Sauce (for 2 dozen perogies)
While cooking perogies prepare:
2/3 cup margarine
1 large chopped onion
2/3 cup of whipping cream
Saute the onions in margarine, and then pour in whipping cream.
Drain your perogies and add to hot sauce. Keep warm for 15 to 20 minutes.
...Enjoy!