Preheat oven to 400°F. Combine cabbage, carrots, snow peas, and bell pepper in a bowl; toss. Combine oil and juice in a bowl. Add oil mixture to cabbage mixture; toss.
Divide cabbage mixture evenly among 4 (14-inch) square pieces of foil; top with fillets. Drizzle 2 tsp. soy sauce over each fillet; sprinkle evenly with salt and black pepper.
Bring edges of foil up over fillets; fold to seal. Place, seal side up, on a baking sheet; bake at 400°F for 20 minutes. Open packets; top with sesame seeds, if desired. Serve with lime wedges.
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