1. Preheat oven to 450°F or heat outdoor grill.
2. In a large bowl, combine oil, garlic, thyme and salt. Add zucchini, corn and shellfish; toss.
3. On each of four 14 x 18-in. sheets of heavy-duty foil, place a quarter of the sweet corn mixture in the center. Top with lemon slices. Draw together longer edges of foil and crimp, leaving room for steam to circulate; seal foil ends (or, divide mixture evenly among four ready-to-use single-portion foil bags).
4. Place packets in a single layer on a large baking sheet or on a rack in a grill. Bake or grill 15 min. for shrimp or 20 min. for scallops. Remove packets; let stand 5 min. before opening.
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