NYT Cooking: This elegant, bright pasta dish comes together in about the same amount of time it takes to boil noodles and heat up a jar of store-bought marinara. The no-cook sauce is a 50-50 mix of ricotta and Parmesan, with the zest and juice of one lemon thrown in. That’s it. To make it more filling, add peas, asparagus or spinach in the last few minutes of the pasta boiling, or stir in fresh arugula or w...