Here is a wonderful condiment for burgers or hot dogs. This recipe for Cabernet onions can be made with red or sweet onions.
1 Tbs olive oil
3 cups sliced onions, about 2
Salt, to taste
3/4 cup Cabernet Sauvignon or other dry red wine
Heat 1 tablespoon oil in heavy medium skillet over medium-high heat. Add onions, sprinkle with salt, and sauté until tender and golden brown, stirring often, about 10 minutes. Reduce heat to medium and continue to sauté until very tender and well browned, about 15 minutes longer. Add wine and cook, stirring occasionally, until liquid is absorbed, about 5 minutes.
DO AHEAD Can be made 3 days ahead. Cool, cover, and chill.