Quick pickled red onion with radishes is a great way to turn an ordinary root vegetable into a delicious side dish for many dinner recipes. It's a great crunchy snack to add to cheese plates and a charcuterie board, or as a topping on avocado toast!
Add vinegar and remove from heat. In separate jars add red onion and radish. Add black pepper and pour in the hot vinegar mixture until everything is covered.