Joie de Vivre French Onion Soup

Joie de Vivre French Onion Soup
3 T butter
1 T vegetable oil
5 large halved and thinly sliced onions
1 tsp sugar
1 tsp salt
2 T all purpose flour
6 cups low-sodium broth (veggie, beef, chicken, goat, whatever you want)
1/3 c dry sherry
½ tsp dried thyme
¼ tsp black pepper
1 loaf French bread, cut into ½" slices
10 to 12 oz Jarlsberg or other hard Swiss-like cheese

In a large heavy pot, melt 2 T butter with olive oil over medium heat. Stir in onions, sugar, and salt. Cook, stirring constantly, 1 minute. Reduce heat, cover and cook 10 minutes. Remove lid and cook 15 minutes more, stirring occasionally. Add remaining butter to pot. Cook, stirring occasionally, until onions are caramelized and very soft, about 15 minutes. Make sure you cook the hell out of them. That’s what makes this soup awesome.