1. 1. Cook the linguine according to package instructions until al dente. Drain and set aside.

2. 2. In a large skillet, heat olive oil over medium heat. Add finely chopped onion and sauté until translucent.

3. 3. Add minced garlic to the skillet and cook for another minute until fragrant.

4. 4. Toss in the cooked linguine and fresh basil leaves. Stir well to combine all the ingredients.

5. 5. Grate Gruyere cheese over the pasta and mix until the cheese is melted and coated evenly.

6. 6. Season with salt and pepper to taste.

7. 7. Serve hot and garnish with additional basil leaves and grated Gruyere cheese if desired.