1. Place bell peppers directly over the flame of a gas-stove burner on high heat or on a grill. Roast peppers, turning with tongs, until blackened all over. (Alternatively, broil peppers on a baking sheet, turning, until skin has charred.)

2. Transfer peppers to a large bowl, and cover immediately with plastic wrap. Set aside to steam, about 15 minutes. Peel peppers; discard skins. Remove stems, seeds, and ribs, and cut each pepper lengthwise into 8 strips. Transfer to a small non-reactive bowl.

3. Toss peppers with garlic and 1 tablespoon oil; set aside to marinate, at least 1 hour or up to 2 days in the refrigerator.

4. Arrange peppers on a serving plate, and top with anchovy strips. Sprinkle with red pepper flakes, if desired, and drizzle with remaining teaspoon oil. Serve immediately.