In this caponata rigatoni dish, the Italian cousin of the French ratatouille sets the tone. Eggplant, tomatoes, celery and garlic are in the spotlight in this generous compote. Olives and capers bring a slight tanginess that goes well with the sweetness of sultanas. Serve this sweet and sour version of the Provençal classic lukewarm for an unparalleled feast on the terrace.