Homemade pub-style pickled onions are easy to make, crunchy and sour with a hint of sweetness, perfect with sharp cheddar cheese or in a dirty martini. Any pub in the UK worth its salt will have jars of pickled onions to serve with a ploughman’s lunch of cheese, bread and ham. The better ones will offer you pickled onions they’ve made themselves. Honestly, it’s so easy, they really all should.