Eggplant Salad with Preserved Lemon

Zahlouk, a classic eggplant salad, appears on both the Muslim and the Jewish table in Morocco. This version is from Simy Danan, whose family lived in Fez after emigrating from Andalusia. Some cooks substitute 3 large peeled tomatoes in place of, or in addition to, the roasted peppers, and add a few tablespoons of grated onion. While preserved lemon is a signature ingredient of Fez, chopped lemon pulp or fresh lemon juice may be used instead. If using preserved lemon, add it gradually