Prepare the sauce: Coarsely chop the remaining shallot and juice the remaining lime. In a mini food processor, combine shallot, 1 tablespoon lime juice, the cilantro leaves, the mint, the chile, the garlic, the fish sauce and 1/4 teaspoon salt. Pulse until herbs are chopped, then add coconut milk and oil. Continue to pulse until a coarse, chunky sauce forms. (Don’t overdo it; you want a relish-like texture, not a purée.) Taste and add more salt, fish sauce and/or lime juice if necessary. (Alternatively, chop everything really finely by hand and stir in the coconut milk and lime juice.) Sauce can be prepared up to 4 hours ahead. Refrigerate until needed.