Really, I'm too impatient for that, so I do it like this:
- I start browning the chopped-up onions in butter or oil. First I set the heat to high, and soon turn it down a bit to avoid burning onions. (Burned onions don't taste good at all. You know this.)
- If herbs or spices are called for, I add them to the onions after I lower the heat. Examples: smoked paprika, herbs de provence, curry powder or curry spices, garlic.
- When the onions in the pan are just beginning to turn light brown: I add a little tiny bit of balsamic vinegar -- like 1/2 teaspoon. I like the Lucini brand, and also the cheaper balsamic at Trader Joe's. This helps the onions turn a beautiful shade of brown, and adds a bit of nice flavor. Fast!
Today I was buying balsamic vinegar at Trader Joe's and the check-out clerk commented on how much she liked it.
"It's even good on fruit," she said.
I told her how I used it to brown onions in this satisfactory but quick way and she seemed delighted -- said she'd definitely try it. She said she thought they would be good as a topping for one of the Trader Joe's cheese products. I hadn't thought of this.
The TJ employee's reaction made me realize that maybe there were other people that would like it if I shared this shortcut to browned onions.
Note: the onion photo is a google image-search screen shot. The other products are from the manufacturers' websites.