The trick to a great French onion soup is starting with good stock. French onion soup is usually made with beef stock. I’ve made delicious soup with stock from the leftover rib and chine bones of a rib roast. Another important element is the proper caramelization of the onions. Caramelizing onions take at least thirty minutes of slow cooking the onions over medium high heat. The browning, or caramelizing, of the onions brings out the sweetness in them.
- 6 large red or yellow onions, thinly sliced
- Olive oil
- 1/4 teaspoon of sugar
- 2 cloves garlic, minced
- 8 cups of beef stock, chicken stock
- 1/2 cup of dry vermouth or dry white wine
- 1 bay leaf
- 1/4 teaspoon of dry thyme
- Salt and pepper
- 8 slices of toasted French bread
- 1 1/2 cups of grated Swiss Gruyere
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