Sautéed red onions, quickly caramelized on the stovetop in butter and olive oil. The key is cooking them on low heat, stirring often until they are sweet and perfectly caramelized! This easy, homemade caramelized onion recipe makes about 1 cup—perfect as a topping for burgers, sandwiches, salads, or as a flavorful make-ahead side dish.
Keyword caramelized red onions, easy caramelized onion side dish, make‑ahead caramelized red onions for freezing, sautéed red onions slow‑cooked low heat, stovetop caramelized red onions in butter and olive oil
Cut the stem and root ends off each onion, and then cut the onion up into 1/4"–1/8" thick slices.
In a large skillet over medium heat, add olive oil and butter, letting the butter melt. Add onion slices and a pinch of salt on top, stirring to fully coat the onions in butter and oil. Cook until onions become translucent, about 7-8 minutes.
Reduce heat to low and continue to cook the onions until they caramelize. Stir every few minutes with a spoon or a pair of tongs until they start to soften and you see their rich color change. This takes about 25-30 minutes. During this time the onions will stop releasing water and they might stick to the skillet, if this happens add a tablespoon of chicken broth and stir to prevent burning. Repeat as necessary.
Serve right away, keep in the refrigerator for up to 4 days or freeze for up to 6 months.