DO-AHEAD TIP: Marinate snapper for 15 minutes (see recipe).
Preheat outdoor or indoor grill to MEDIUM-HIGH or oven broiler.
Season fillets evenly with salt and pepper then grill/broil for 4 minutes per side (depending on thickness) or until just opaque.
Meanwhile, in a small saucepan over medium heat, combine vinegar, strawberries and basil; heat through.
Serve strawberry/basil mixture over grilled/broiled fish.