Place the hard-boiled and peeled eggs in a large glass jar.
In a saucepan, combine the vinegar, water, sugar, and salt. Bring to a boil over medium heat.
Once the mixture is boiling, add the peppercorns, mustard seeds, garlic cloves, onion slices, and dill.
Reduce the heat and let the mixture simmer for about 5 minutes to blend the flavors.
Pour the hot vinegar mixture over the eggs in the jar, ensuring the eggs are completely submerged.
Seal the jar with a lid and let it cool to room temperature before refrigerating.
For the best flavor, let the eggs pickle in the refrigerator for at least 2-3 days before serving.