1/2 cup diced red bell pepper, or hot chile such as serrano
Slice eggplants into 1/4-inch thick rounds. Sprinkle with salt, and layer in a colander. Set aside to drain for 20 minutes.
Press slices with paper towels to remove moisture. Preheat a gas or charcoal grill, (or place a stove-top grill pan over high heat). Slice squash and zucchini into 1/4-inch thick rounds, and slice tomatoes into 1/2-inch thick rounds.
Lightly brush all vegetables with oil, then grill turning once, until tender and slightly charred.
Whisk together oil, vinegar, parsley and basil. Season with salt and pepper.
To assemble: Place 1 eggplant round on a plate and stack on top a tomato round, a second eggplant round, and squash and zucchini rounds. Drizzle with dressing and top with diced red pepper.