1. Heat broiler.
2. In a small bowl, combine the brown sugar, soy sauce, and ginger; set aside.
3. Place the fish on a foil-lined broiler proof rimmed baking sheet. Drizzle with 1 teaspoon of the oil and season with salt and pepper. Broil until the fish is opaque throughout, 5 to 7 minutes, basting with the soy mixture twice during the last 2 minutes of cooking.
4. Meanwhile, heat the remaining 2 tablespoons of oil in a large skillet over medium high heat. Add the zucchini, squash, crushed red pepper, and 1/2 teaspoon salt and cook, tossing frequently, until just tender, 5 to 7 minutes; fold in the mint.
5. Serve with the fish.
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