Peel 8 hard boiled eggs and place into a quart-sized mason jar, or other glass, plastic, or ceramic container with a sealable lid. Add in 1/4 sliced red onion, 3 whole garlic cloves, 3 sprigs fresh dill, 1 teaspoon whole black peppercorns and your choice of peppers (if making spicy pickled eggs).
In a small saucepan, stir together 1 cup distilled white vinegar, 1 cup water, 2 tablespoons granulated sugar, and 1 teaspoon saltBring to a boil, and then promptly remove from the heat.
Pour mixture over eggs in jar until full. Place the lid on and let cool to room temperature.
Once cooled, store in the refrigerator. Let them sit and pickle for at least 12 hours before eating.