Heat olive oil in a large pot or Dutch oven over medium-high heat.
1 tablespoon extra virgin olive oil
Add ground lamb, season with salt and pepper, and cook until browned and slightly crispy, then drain excess fat if needed.
1 pound ground lamb, Salt and black pepper
Reduce heat to medium-low and stir in butter, onion, celery, and carrots. Season lightly with salt and pepper, cover, and cook for 3–5 minutes until softened.
2 large celery stalks, 2 large carrots, ½ cup white onion, 2 tablespoons unsalted butter
Stir in tomato sauce, tomato paste, and dried thyme, cooking for 5 minutes until slightly thickened.
4 cups canned tomato sauce, ¼ cup tomato paste, ½ teaspoon dried thyme
Pour in chicken broth and simmer over medium heat for 25–30 minutes, stirring occasionally.
½ cup chicken broth
Meanwhile, cook linguini in salted water according to package directions and drain.
8 ounces linguini
Serve the pasta topped with the lamb Bolognese sauce.
Garnish with grated Parmesan and fresh parsley before serving.
Grated Parmesan cheese, Fresh parsley