If the tomato lacks aroma, it generally lacks flavor. Ripe tomatoes should yield to light pressure, but not be too soft. If purchasing tomatoes that will not be used for a few days, select those that are a lighter red and allow them to ripen fully by storing them in a cool area out of the direct sunlight. To hasten the ripening process, place them in a brown paper bag and store them overnight in a dark area, or try placing them in a covered bowl with an apple. The apple gives off ethylene gas, which speeds up the ripening process.