02Add another 1/4 cup olive oil to the pan, then the anchovies, onions, garlic and herbs. Cook for 5 to 7 minutes, until the onions get nice and caramelized. Add the tomatoes and cook that down for 10 to 12 minutes, until pulpy. Return the eggplant and zucchini to the pan, crack open the chile, and add that too. Season with salt and pepper and let the ratatouille cook slowly for about 20 minutes, until the mixture is soft, mushy and juicy; you want all the flavors to come together. Stir in the vinegar and let cool to room temperature.