Boiling is the most traditional way to cook pierogies, and it's a great way to get started. Simply fill a large pot with salty water, bring it to a rolling boil, and then gently add your frozen pierogies. Make sure to stir them occasionally, or they might stick together like a group of friends at a pierogy party.
Now, here's a pro tip: once your pierogies start floating to the surface, they're done! It's like they're saying, "Hey, I'm cooked, get me out of here!" Remove them with a slotted spoon, and serve them with your favorite toppings - sour cream, chives, or even some caramelized onions. Yum!