Cooking time: 1 hour
Easy - for beginners
Melt butter with oil in a heavy large pot, over low heat.
Add onions, leeks, and garlic. Cook until onions soften, stirring occasionally, about 15 minutes. Increase heat to medium-low and add sugar. Cook until onions are deep golden brown, stirring frequently. Add flour and stir 3 minutes.
Add stock, vermouth, hot pepper sauce and pepper. Simmer 40 minutes.
Traditionally served with a toasted round of good bread (French or Italian) and a slice of cheese on top. (Provolone or your choice) Then put under a broiler until the cheese is melted.