2mediumred onionsthinly sliced—use a mandoline for uniform ribbons.
1cupapple cider vinegaror white vinegar; rice wine vinegar works too for a milder tang.
1cupwaterfiltered if your tap is chlorinated
2tbspgranulated sugarsub honey 1:1 for depth
1tbspkosher salttable salt at ¾ tbsp if that’s all you have
1bay leafoptional, but it adds subtle herbal notes
1/2tspblack peppercornsfreshly cracked if possible
1/4tspred pepper flakesfor a quick spicy kick
1tspmustard seedsadds diamond-bright pops of flavor
1sprigfresh dill or 1 tsp dill seedsoptional but lovely
Instructions
Grab a sharp knife or mandoline and slice onions into 1/8-inch ribbons. Even thickness means uniform crunch. Tip: chill onions beforehand for snappier slices.
In a small saucepan, stir together vinegar, water, sugar, and salt. Warm gently over medium heat just until sugar dissolves—no need to boil. You’ll see tiny bubbles cling to the sides.