These bright pink, tangy pickled red onions take 10 minutes and just one red onion, two vinegars, a spoonful of maple syrup and sea salt. They keep in the fridge up to 2 weeks, ready for tacos, bowls and avocado toast.
Thinly slice the onion, using a mandoline for even slices if you have one. Pack the slices into a 16-ounce heat-proof glass jar.
Pour in the boiling water, vinegars, maple syrup and salt. Seal the jar tightly and let cool to room temperature, then refrigerate.
Let the onions pickle for at least 1 to 2 hours, or ideally overnight, before serving.
Notes
Storing: The onions keep in a sealed glass jar in the fridge for up to 2 weeks.
Vinegar Swaps: Rice vinegar gives a milder, slightly sweet pickle, and red wine vinegar a bolder, tangier one.
Spice Level: For heat, add a few jalapeño slices or a pinch of red pepper flakes to the jar. Whole peppercorns or coriander seeds add warmth without much heat.
Serving Ideas: Pile them on tacos, grain bowls, salads, veggie burgers or avocado toast.