Sweet and Sour Fish

Name: Sweet and Sour Fish
Ingredients: 3 tablespoons fish sauce; 3 tablespoons sugar; 1 lime, juiced; 3 tablespoons finely minced peeled ginger; 2 tablespoons minced lemongrass (tender part 1 small stalk); 4 scallions (white and green parts), whites chopped, and greens cut into 1-inch pieces; 3 tablespoons peanut oil; 4 (6-ounce) snapper fillets, skin on and scored (about 1 1/2 pounds)(or catfish without skin); Freshly ground black pepper; 1/2 cup grape tomatoes, halved; 1/4 cup fresh basil or cilantro leaves; Suggested accompaniments: white rice and lime wedges