- Preheat a broiler.
- Put the bell peppers on a baking sheet and broil, turning as needed, until blistered and charred on all sides, 10 to 15 minutes. Alternatively, using tongs or a large fork, hold the peppers, one at a time, over the flame of a gas burner and turn as needed until evenly blistered and charred. Transfer the blackened peppers to a brown paper bag and seal loosely, or place in a bowl and cover. Let cool to the touch. Remove the peppers and peel away the charred skin. Slit lengthwise and remove and discard the stems and seeds.
- Finely chop the peppers and put in a serving bowl. Add the garlic, chives and basil to taste, and the olive oil. Season with vinegar, salt and pepper. Set aside.
- Bring a saucepan three-fourths full of water to a boil over high heat. Add pinches of salt and sugar and the zucchini and boil rapidly until the zucchini is tender-crisp, about 5 minutes. Drain the zucchini well. Alternatively, bring water to a boil in a steamer pan, put the zucchini in a steamer rack over the water, cover and steam until tender-crisp, 3 to 4 minutes. Remove the zucchini from the rack.
- Add the zucchini to the bell pepper mixture and toss well. Serve immediately.