The basis of any salad, leafy greens, offer a huge nutritional benefit. Among the best of the super greens group are: kale, spinach, beet greens, watercress and Romaine lettuce. For something a little different, try adding fresh dandelion greens and mizuna as well. Brightly colored fruits and vegetables in the "red" family are of particular nutrition benefit. This includes produce with orange, purple, red and burgundy flesh. Some examples are tomatoes,...