For an extra layer of flavor, try grilling the red peppers yourself before roasting them. Simply place them directly on the grill grates until the skin is blackened, then transfer them to a bowl covered with plastic wrap to steam. The skins will easily peel off, leaving you with smoky, sweet peppers. This salad can be made ahead of time and stored in the refrigerator for up to 3 days. The flavors will meld together beautifully over time. If you don't have a grill, you can roast the eggplant in the oven. Toss the eggplant slices with olive oil, salt, and pepper, and roast at 400°F (200°C) for 20-25 minutes, or until tender and slightly browned.