01 -
Place eggs in a single layer in a pot and cover with cold water by one inch. Bring to a boil, then remove from heat, cover, and let stand for 12 minutes. Transfer to an ice bath until fully cool, then peel carefully.
02 -
Combine vinegar, water, sugar, mustard, salt, mustard seeds, turmeric, peppercorns, and garlic in a saucepan. Bring to a simmer over medium-high heat and cook for 5 minutes, stirring occasionally, until the sugar and salt dissolve. Remove from heat and let cool completely to room temperature.
03 -
Layer the peeled eggs and onion slices in a clean 2-quart glass jar, alternating so the onions are distributed throughout.
04 -
Pour the cooled brine over the eggs and onions, making sure everything stays submerged. Seal the jar tightly.
05 -
Store the jar in the refrigerator for at least 5 days before eating. The flavor deepens the longer they sit, and they will keep for 3 to 4 months while cold.