Boil pasta as instructed.
Zest lemon.
Combine lemon zest, juice from the lemon, garlic, ricotta, grated parmesan, and sea salt. Stir until smooth.
Add 1/2 cup of pasta water and stir until smooth.
Add spinach and stir until the spinach has wilted.
Add in the pasta and stir until it is evenly coated.
Serve immediately. It will thicken up as it sits out.