Grill halibut in foil packets for a moist, tender fish that won't break apart. Paired with zucchini, cherry tomatoes, lemon, and herbs for a delicious and easy meal.
Preheat your outdoor grill to 400 degrees F (200 degrees C).
Spray each foil sheet with olive oil cooking spray. In the center of each foil square, layer 2 onion slices, half of the zucchini, half of the cherry tomatoes, and half of the corn.
Scatter half the garlic over each pack and season lightly with sea salt and black pepper.
Pat the halibut filets dry using paper towels and add one filet to each packet. Brush each filet with a thin layer of mayonnaise, season with sea salt, black pepper, and Italian herbs, and drizzle with 1 tablespoon of white wine.
Top each filet with two lemon slices and scatter thyme sprigs over the contents in each packet.
Bring edges of foil together, fold edges over twice, and press tightly along the folds to seal, leaving some space inside for steam.
Place packets directly on the preheated grill grates. Close the lid and grill about 10 minutes per inch of filet thickness. Remove packs from the grill, let them rest for about 5 minutes, and check that an instant read thermometer inserted into the thickest part of fish reads 145 degrees F (63 degrees C).
When ready to serve, carefully open the packets (due to steam) and place them on serving plates.
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