Pickled Red Onions are a great way to use leftover red onion and are a great topping for tacos, sandwiches, pizza, and more. @budgetbytes http://www.budgetbytes.com/2016/08/pickled-red-onions/comment-page-1/
Quick Pickled onions - bon appetite 1/2 c apple cider vinegar 1T sugar 1 1/2 tsp. Kosher salt 1 red onion, thinly sliced whisk first 3 ingredients and 1 cup water small bowl to dissolve salt & sugar. Place opinion in jar, pour vinegar mixture over. Let sit 1 hour. DO AHEAD. Can keep 2 wks. in refrigerator. Cover chill, drain before using.