4 small or 2 large heads radicchio (about 1 pound)
2 tablespoons olive oil
1/4cup balsamic vinegar
1 tablespoon brown sugar or honey
Salt and pepper
Instructions
Prepare a charcoal or gas grill or turn on the broiler for moderately high heat; put the rack about 4 inches from the heat source.
Halve or quarter the radicchio lengthwise, depending on their size. Rub or brush them with the oil, taking care to keep the wedges intact. Whisk the vinegar and sugar in a small bowl until the sugar is dissolved.
Put the radicchio wedges on the grill or on a broiler pan, cut sides toward the heat. Grill or broil for a minute or 2, then carefully turn and brush or drizzle with the vinegar mixture. Cook until just starting to crisp and char around the edges, another couple of minutes. Transfer to a plate or platter and sprinkle with salt and lots of black pepper. Serve hot or at room temperature.