This spicy pickled red onion is a quick, fresh condiment made with lime (or vinegar), garlic, parsley, and hot pepper. It’s bright, sharp, and best enjoyed within 2–3 days.
Slice the onion: Peel and slice the red onion with a knife or mandolin, keeping slices not too thin and not too thick so they soften without turning limp.
Prepare the garlic: Peel the garlic and slice thinly, or chop finely if you prefer it to blend into the condiment.
Chop the parsley: Remove the hard stems and finely chop the parsley leaves only.
Prepare the hot pepper: Remove the stem and chop finely. For a less invasive heat, remove the seeds before chopping.
Add the acid: Squeeze the juice of two limes into the bowl, catching seeds as you go. If using vinegar, add it here instead, or combine vinegar and lime juice.
Season and mix: Add salt and black pepper, then mix well until everything is coated and evenly distributed.
Jar and refrigerate: Spoon into a sterilized glass jar or mason jar, seal, and refrigerate.