Place eggplant over a gas burner set on high (or place under broiler). Cook, turning as needed, until blackened and soft. Set aside to cool. Remove skin; discard. Coarsely chop eggplant; drain in a colander for 15 minutes. Combine eggplant, tomato, onion, olive oil, vinegar, and parsley; season with salt and pepper. Serve at room temperature with crudites, bread, and crackers.