I'd probably make some kind of simple cream sauce, if the ravioli is stuffed with lobster.
Not long ago, we ate at a chain Italian restaurant and I ordered the lobster ravioli. The ravioli was stuffed with lobster, and not much else. The "sauce" was mainly more lobster, and not much else. Although I love lobster, this was -- I can't believe I'm saying this -- too much lobster.
So I'd put lobster in the ravioli or on top of the ravioli, but not both places.