Step 1Combine the thyme, basil, rosemary and vinegar in a bowl or jar. Slowly beat in the oil to blend well. Makes 1 1/2 cups.
Step 1Heat the broiler.
Step 2Whisk together the oil, thyme, basil, oregano, garlic and black pepper.
Step 3Slice the zucchini, squash, eggplant and red onion into 3/4-inch-thick slices and place them on a broiling pan. Brush them with the marinade and broil until lightly browned, 2 minutes on each side. (You can also grill the vegetable slices over high heat 2 minutes a side; keep an eye on them so they don't burn.)
Step 4Place the red and green peppers about 4 inches beneath the broiler and broil until their skin begins to blister, turning so all sides char, 12 to 15 minutes. Place the peppers in a resealable plastic bag to steam 10 minutes, then peel them when they're cool enough to handle.
Step 5Dice the zucchini, squash, eggplant, onion and bell peppers into 3/4-inch squares. Drizzle 1/2 cup of the Vinaigrette over the vegetables and toss to coat well. Chill the vegetables at least 30 minutes. Store any remaining Vinaigrette in refrigerator for future use in salads.