French onion soup gets its full-bodied taste from slow-cooked, caramelized onions. Here, we call for three types of onions for rich, balanced flavor, but the recipe will work with any combination or just one variety.
It’s full of natural flavor, and only needs a little salt and pepper to bring it alive. It’s especially good if you have time to make vegetable stock with all of the flavorful vegetable trimmings.
