For tacos, nachos, sandwiches, salads, or anywhere a punchy pickled garnish is needed. Feel free to vary the seasonings. For instance, add fresh tarragon and mustard seeds, or dried chiles and Garam Masala.
Peel, halve through the stem end, and trim the ends off:
Very thinly slice lengthwise (pole-to-pole). Place the onion in a small saucepan with:
Bring to a simmer and cook for 3 minutes. Transfer immediately to a bowl and stir in:
Stir to melt the ice cubes and cool the pickle. Use immediately or transfer to a clean pint jar or container and store refrigerated for up to 1 month.