Slow Cooker Caramelized Onions
Let your slow cooker do all the work of making beautifully caramelized onions. Freeze what you don't use right away so you'll have caramelized onions ready in a snap for soups, burgers, omelets, pizzas, and more.
Substitute butter with olive oil, if desired.
After 10 hours of cooking, reserved liquid can be strained and used to make soup or sauce.
Onions can be cooked longer for a deeper brown and more concentrated flavor, if desired. To reduce further, leave the liquid in and cook, stirring occasionally, until the onions are darker brown and the liquid is almost completely cooked off, 4 to 5 hours.