Grilling brings out the sugars in the lettuce and salad greens, tempering the bitterness and adding flavor.
This salad can be made on a regular barbecue grill or in a grill pan on the stove.
Prepare the barbecue (medium-high heat) or heat a grill pan on the stove top.
Drizzle 1 tablespoon of oil over the endive, radicchio and romaine, then sprinkle with salt and pepper.
Grill the lettuces until they are crisp-tender and browned in spots, turning occasionally, about 6 minutes. Coarsely chop the lettuces, then toss them in a large bowl with the remaining oil and vinegar. Season the salad, to taste, with more salt and pepper. Serve warm.