Put the spinach with about 2 tablespoons of water in a large pot and steam covered for about 6 minutes. Prepare noodles in boiling salted water according to package instructions. Wash and halve the tomatoes and fold them into the spinach.
Drain the ravioli, drain thoroughly and also fold into the spinach. Season to taste with salt and pepper. Arrange the ravioli on preheated plates and garnish with basil.