Prepare the pasta according to package directions. Before draining off the water, reserve 1/2 cup of pasta water to use as needed in the ricotta sauce.
In a skillet over medium heat, heat the olive oil.
Once hot, add the garlic and cook 1 minute. Add the drained pasta and ricotta and a few tablespoons of the pasta water.
Cook and stir for 4 minutes until water is absorbed and ricotta coats the pasta evenly. Add additional pasta water as needed to prevent the ricotta from burning.
Add the Parmesan cheese, lemon zest, salt and pepper, to taste. Stir well and serve immediately.