Quite possibly you already know how to cook, but then there are the secret culinary weapons—condiments, sauces, dressings—that can make a good meal spectacular. While providing a host of suggestions, Yotam Ottolenghi also shows how the leftovers can be repurposed time and again in other recipes throughout the week, helping you stock your fridge and pantry. And this is where the fun really begins, with extras like marinated feta, slow-cooked za'atar tomatoes, and pickled chile, each more adaptable than we ever realized.