The secret to creating a crisp jar salad that will keep fresh overnight is in the layering: place the dressing at the base, add protein or grains, then nuts or seeds, and end with the leafy greens and herbs on top. Decant the salad into a bowl when you're ready to eat. The 52 recipes featured here cater for all tastes and dietary requirements and include classic combinations, such as a Niçoise, and more exotic options, such as a Middle Eastern Beef salad.