These golden brown caramelized onions are such a tasty topping or add-in for so many things! You'll want to make a batch of them every week during your meal prep!
Heat a wide-low dutch oven over medium-low heat. Add butter and cook until melted. Add onions and stir to coat. Let them cook for 20 minutes without stirring.
After 20 minutes stir them a few times and scrape any brown bits off the bottom of the pan. Cook for another 15 minutes.
After cooking for a total of 35 minutes add the sherry and scrape the bottom of the pan so most of the brown bits are removed. Stir a few times to incorporate the fond (brown bits) into the onions.
Cook for an additional 10 - 20 minutes depending on the desired degree of doneness.
Remove from heat and serve as needed or store in an airtight container.
Notes
You can freeze caramelized onions in an ice tray for easy use at a later date.