Cook the pasta according to the packet instructions, or until al dente. Drain and reserve a cupful of the cooking water. If using fresh spinach, cook it with a splash of water in a saucepan for 1 ...
Meanwhile, mix the ricotta and chopped sage together in a bowl and season with salt and pepper to taste. Drain the pasta in a colander and rinse under cold running water to cool completely.
Add the pasta and cook according to the packet instructions. Drain and shake dry, then toss in 3 tablespoons of the balsamic dressing. Set aside to cool. Combine the ricotta with the lemon juice ...