Caramelized onions are a sweet, golden treat that elevate everything from burgers to soups, pizzas, and sandwiches. They’re a classic addition to many recipes but can take a long time to make on the stovetop. With this crockpot method, you can achieve the same rich, deep flavor with minimal effort. Simply toss your onions in the slow cooker, let them work their magic for hours, and enjoy the convenience of perfectly caramelized onions without constant stirring.
Ingredients:
- 3–4 pounds of yellow onions (about 6–8 medium-sized), thinly sliced
- 3 tablespoons unsalted butter or olive oil
- 1 teaspoon salt
- 1 teaspoon sugar (optional, enhances sweetness)
- 1–2 tablespoons balsamic vinegar (optional, for added depth)
Instructions:
- Prepare the Onions: Peel and thinly slice the onions into even slices. This ensures uniform cooking.
- Assemble in Crockpot: Add the sliced onions to the crockpot. Toss them with the butter or olive oil, salt, and sugar if using.
- Set and Cook: Cover the crockpot with the lid and cook on low for 8–10 hours, stirring every few hours if possible. The onions will soften, release their natural sugars, and gradually turn golden brown.
- Check for Doneness: After 8 hours, check the color and texture. If deeper caramelization is desired, continue cooking for an additional 1–2 hours. Stir in balsamic vinegar at the end for a richer flavor, if desired.
- Store: Let the caramelized onions cool before transferring them to an airtight container. Store in the refrigerator for up to a week or freeze in portions for up to 3 months.
Tips:
- For more caramelization, leave the lid slightly ajar for the last 1–2 hours to allow excess moisture to evaporate.
- Use red or sweet onions for a slightly different flavor profile.
These crockpot caramelized onions are a versatile, time-saving ingredient that you’ll want to have on hand for any meal.
