In a large pot of boiling salted water, cook your choice of pasta according to package directions until al dente, about 8-10 minutes.
While the pasta is cooking, combine the whole-milk ricotta, extra virgin olive oil, grated Parmesan cheese, grated garlic, and both zest and juice from the unwaxed lemon in a medium bowl. Season with salt and pepper.
In the last minute of cooking time for the pasta, reserve 1/2 cup of the cooking water before adding the fresh baby spinach directly into the pot with the pasta. Stir well to ensure that all leaves are submerged.
After draining, return both the drained pasta and cooked spinach back into the same pot. Add in your prepared ricotta sauce along with some reserved cooking water until you achieve a smooth and creamy consistency.
Immediately plate your lemon ricotta pasta topped with additional grated or shaved Parmesan cheese and a drizzle of extra virgin olive oil. Add lemon wedges on the side if desired.