Serve this flavorful salad alongside roasted chicken, polenta, or grilled steak.
Heat broiler, with rack in top position. Place bell peppers on a foil-lined rimmed baking sheet. Broil, turning occasionally, until charred on all sides and tender, about 10 minutes. Transfer to a bowl, cover tightly with plastic wrap, and let steam 20 minutes. Rub with paper towels to remove skin. Stem, seed, and cut each pepper lengthwise into 4 pieces.
Arrange peppers on a serving platter, drizzle with oil, and top with capers, olives, vinegar, and lemon zest. Season with salt and pepper and sprinkle with basil.