Heat butter in a skillet over medium low heat until it foams. Add shallots and cook, stirring, for 2 minutes. Add the sage and cook until leaves turn slightly crisp, another 2-3 minutes. Season with salt and pepper.
Add cooked ravioli to the skillet and toss gently. Add 1/3 cup parmesan and toss gently again. Divide among dishes and top with remaining parmesan and another grinding of fresh pepper.