A red onion is a type of vegetable that has a purple or reddish skin and is commonly used in cooking to add flavor or a pop of color to dishes. Full definition
Try adding a few thinly sliced red onions with the arugula, or perhaps your favourite salad dressing in lieu of olive oil (I use pear & blue cheese vinaigrette). (epicurious.com)
This recipe also makes a fabulous crowd pleasing appetizer by using it to drizzle over top of roasted chicken topped with red onion slices wrapped in lettuce. (biomeonboardawareness.com)
Pour the lemon juice over the chopped red onion in a small bowl and let it sit while preparing the rest of the ingredients. (golubkakitchen.com)