On microwave-safe plate, arrange tomato slices in single layer.
Arrange fish to cover tomatoes; drizzle with oil and lemon juice.
Sprinkle with basil, and pepper to taste.
Cover with vented plastic wrap; microwave at high (100%) power for 3 minutes or until fish is almost opaque and flakes easily when tested with fork.
Remove from oven and let stand for 1 minute.
If necessary, pour off excess liquid from plate.