Zucchini, Bell Pepper and Onion Jam

Every southern European culture has its own mixed vegetable spread: Provence has ratatouille, Sicily, caponata. In Spain, you find the Catalan samfaina, the Andalusian alboronia, and pisto, which is popular in the rest of the country, especially in La Mancha and the Basque Country. Similar to ratatouille but minus the eggplant, the flavor of pisto is sweeter because of the red bell peppers and onion. Serve it as a spread for bread or toast, a base for canapés, or