Let us eat lettuce! Lettuce is super-easy to grow. Just harvest the leaves frequently, otherwise it will bolt, or start to send up tall shoots and flower. Then it will be bitter and you won't want your lettuce anymore.
Tomatoes need calcium to achieve their full flavor potential. When planting tomato plants crush up (to powder) about 4 or 5 egg shells and put them in the bottom of the hole. Then plant tomato on top. They'll provide calcium and prevent blossom end rot.