# Ingredient List:
→ Vegetables
01 - 3 large yellow onions, thinly sliced
02 - 2 cloves garlic, minced
→ Pasta
03 - 12 ounces dry fettuccine or linguine
→ Liquids
04 - 1/4 cup dry white wine
05 - 4 cups vegetable or beef broth
→ Dairy
06 - 2 tablespoons unsalted butter
07 - 1 cup grated Gruyère cheese
08 - 1/2 cup grated Parmesan cheese
→ Pantry
09 - 2 tablespoons olive oil
10 - 1 teaspoon sugar
11 - 1/2 teaspoon dried thyme
12 - 1 bay leaf
13 - Salt and freshly ground black pepper, to taste
→ Garnish (optional)
14 - Fresh parsley, chopped
15 - Extra Gruyère or Parmesan cheese
# Directions:
01 - Heat butter and olive oil in a large deep skillet or Dutch oven over medium heat. Add sliced onions and sugar. Cook, stirring occasionally, until onions turn deep golden brown and caramelize, about 20 to 25 minutes.
02 - Add minced garlic to the skillet and cook for 1 minute until fragrant.
03 - Pour in the dry white wine to deglaze the pan, scraping up browned bits. Cook until wine is mostly evaporated, approximately 2 minutes.
04 - Stir in dried thyme, bay leaf, and broth. Bring the mixture to a boil.
05 - Add uncooked pasta to the pot. Stir well, reduce heat to medium-low, and simmer uncovered, stirring frequently, for 10 to 12 minutes until pasta is al dente and most liquid is absorbed.
06 - Remove bay leaf. Stir in Gruyère and Parmesan until fully melted and creamy. Season with salt and freshly ground black pepper to taste.
07 - Serve immediately, garnished with fresh parsley and additional cheese if desired.