Creating Saucy Sausage and Lemon Pasta is straightforward if you follow these steps:

1. Cook Pasta: In a large pot, bring salted water to a boil. Add the pasta and cook according to package instructions. Reserve 1 cup of pasta water and drain the rest.
2. Prepare Sausage: While the pasta cooks, heat olive oil in a large skillet over medium heat. Remove sausage from casings and add to the skillet. Brown the sausage, breaking it into pieces with a spatula.
3. Add Garlic and Spices: Once the sausage is cooked through, add the minced garlic and red pepper flakes (if using). Sauté for about 1-2 minutes until fragrant.
4. Incorporate Broth and Lemon: Pour in the chicken or vegetable broth, lemon zest, and lemon juice. Stir well, allowing the flavors to meld for about 2 minutes.
5. Add Tomatoes and Spinach: Toss in the halved cherry tomatoes and fresh spinach. Cook until the spinach is wilted and the tomatoes soften, about 3-4 minutes.
6. Combine with Pasta: Add the cooked pasta to the skillet. Toss everything together, adding reserved pasta water a little at a time until you reach your desired sauce consistency.
7. Season: Taste and season with salt and pepper as needed, ensuring the flavors are well balanced.
8. Garnish and Serve: Remove from heat and garnish with fresh basil or parsley and a generous sprinkle of grated Parmesan cheese.

These steps will guide you effortlessly through the cooking process, resulting in a vibrant and flavorful dish.