01 -
Heat olive oil and butter in a large skillet over medium heat. Add sliced onions and cook for 20–25 minutes, stirring occasionally, until deeply caramelized. Stir in minced garlic, cooking for 1–2 minutes. Remove from heat and set aside.
02 -
In a large bowl, combine ground beef, eggs, breadcrumbs, Worcestershire sauce, dried thyme, salt, and pepper. Fold in half of the caramelized onions. Mix just until incorporated to maintain a tender texture.
03 -
Preheat oven to 175°C. Shape meat mixture into a loaf on a baking dish or in a loaf pan. Bake for 45–50 minutes, until an internal temperature of 71°C is reached.
04 -
While the meatloaf bakes, place the remaining caramelized onions in a skillet with beef broth. Simmer for 5–7 minutes, allowing the sauce to reduce and thicken.
05 -
Remove meatloaf from the oven. Sprinkle with grated Gruyère cheese and place under a grill (broiler) for 3–5 minutes, until golden and bubbly.
06 -
Let meatloaf rest for 5–10 minutes. Slice and serve with the warm onion sauce spooned on top.