Trim the tops to one inch or less, spread them out on a rack for a couple days to let the skins dry. It makes it easier to peel. Caramelizing is yummy!
Or, try thin slices, mixed with a good vinegar (white wine or apple cider), a bit of salt and a quick grinding of black pepper - adding in a touch of sugar, and/or some fresh herbs - quickie pickle, crunchy and will keep a long time in the fridge.
Spear some peeled onions on a skewer, spray/brush with olive oil, and grill 'til slightly blackened, and smelling great. Cut in to chunks, and use in a salad, or over grilled chicken, fish or meat, or nibble.