Plentiful during the summer months, tomatoes grow on vines and are at their freshest from May through October. Tomatoes come in thousands of varieties of all sorts of colors and shapes, the smallest being the grape tomato and the largest being the beefsteak tomato. Heirloom tomatoes have been popular lately due to their unique colors and shapes, and their intense tomato flavor. Heirloom tomatoes grow from seeds passed down from generation to generation, and over the years have developed natural resistance to insects and diseases. When choosing tomatoes at the grocery store, look for slightly