How to boil frozen pierogies

This is not a recipe, but a method we learned from the owner of the Polish Market in Vienna, VA: bring a large pot of water to boil. Place the frozen pierogies gently into the pot, one at a time, making sure the water continues to boil vigorously. (Avoid adding so many pierogies that the water temperature drops.) All of the pierogies will fall to the bottom of the pot. When they float to the top, they are ready to eat (less than 5 mins). I grew up eating pierogies, and they always remind me of childhood. (Apr. 2018)