How to Make It
Preheat the oven to 425°. In a small bowl, whisk the balsamic and cider vinegars with the olive oil, lemon juice and minced garlic. Season the dressing with salt and pepper.
Arrange the peppers in a large baking dish, pour the dressing on top and toss to coat. Bake for about 30 minutes, or until barely tender. Add 1/4 cup of water to the pan and bake for about 20 minutes longer, or until the peppers are tender and blackened in spots; add more water to the pan if it dries out.
Transfer the peppers to a large platter and pour the pan juices over them. Just before serving, sprinkle with the chive flowers. Serve warm or at room temperature.