Grilled Mahimahi With Peach And Pink Grapefruit Relish

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10 Ingredients

• 1/3 cup rice vinegar
• 2 Tbsps brown sugar
• 1/2 cup finely chopped red onion
• 2 1/2 cups diced peeled ripe peaches (about 1 1/2 lbs)
• 1 1/2 cups pink grapefruit sections (about 2 large grapefruit)
• 1/2 cup small mint leaves
• 3/4 tsp salt, divided
• 1/2 tsp black pepper, divided
• 6 (6-oz) mahimahi or other firm whitefish fillets (about 3/4 inch thick)
• Cooking spray