Choose tomatoes that have rich colours. Deep reds are a great choice, although tomatoes of all colours offer exceptional benefits nutrients. Tomatoes should be smooth and without wrinkles, cracks, bruises or blemishes. They should not have a swollen appearance since that feature is often associated with flavour and also could be the result of excessive waste during preparation. Ripen tomatoes will yield to slight pressure and have a sweet fragrance significantly.
If you purchase canned tomatoes, it is often better to buy from those countries having strict standards for lead content in containers. This is especially important with a fruit such as tomatoes, with high acid content that cause corrosion and subsequent migration to food of metals with which it is in contact.
While on the subject of canning, you may also be interested in some of the most recent information on BPA (Bisphenol A) and canned tomato products. BPA is an additional component used in many canned foods. It has been known that is problematic because of the impact of oestrogen on the metabolism.
In many cases, you may be able to find a local organic producer who sells tomatoes. Tomatoes are sensitive to cold, and to prevents their maturation process, you must store them at room temperature and out of direct exposure to the sun. It will keep for up to a week, depending on how mature they are purchased. To speed up the ripening process, place them in a paper bag with a banana or an Apple since the gas ethylene emitted by these fruits will help accelerate the maturation of tomato. If tomatoes are becoming mature, but still not ready to eat them, place them in the refrigerator (if possible, in the butter compartment which is a hotter area), where it will keep for one or two days more. Remove from the refrigerator about 30 minutes before using them will help to regain their maximum flavour and juiciness.
Tomato sauce can be surprisingly a good source of nutrients of the tomato, the lycopene. But if you buy tomatoes in tomato sauce form, we recommend you to choose organic tomato sauce. We make this recommendation not only because it is likely that if you buy organic, but also because we have seen a recent study showing higher content of lycopene in avoiding waste of unwanted pesticides and other contaminants organic versus non-organic ketchup.