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Bring a medium pot of salted water to a boil (use a large pot for 4 servings). Once boiling, gently add ravioli to pot. Reduce heat to low. Cook, stirring occasionally, until tender and floating to the top, 3-4 minutes. Reserve 1½ cups pasta cooking water (2 cups for 4), then drain. TIP: Toss ravioli with a large drizzle of olive oil after draining to keep from sticking.
Meanwhile, wash and dry produce. Halve, peel, and thinly slice shallot. Quarter lemon.