½cupParmigiano Reggiano plus additional for garnish
2sprigs fresh thyme or substitute with ½ teaspoon dried thyme
Instructions
Heat a large pan over medium-high heat, add the olive oil and butter. Cook until the olive oil is shimmering and the butter is melted.
Add the sliced onions and cook until softened.
Stir in the garlic, salt, pepper and sugar. Continue to cook on medium-low for 30-40 minutes until golden and caramelized, stirring frequently. Once caramelized, stir in the thyme and add the red wine deglazing the pan by scraping up the brown bits on the bottom of the pan.
Add the uncooked pasta and beef stock. Simmer over medium heat for 15-20 minutes or until most of the stock is absorbed. Stir frequently so the pasta doesn’t stick to the bottom of the pan.
Stir in the heavy cream and Parmesan. Stir to combine.
Top the pasta with the gruyere and transfer to the oven. Bake for 10 minutes or until the cheese is golden brown and the pasta is bubbling.