For many of us, perfectly ripened red, yellow or even purple tomatoes are the crown jewels of the farmers market. There are intriguing heirlooms, juicy Beefsteaks, sweet Sun Golds and cherries, as well as oblong plum tomatoes that are perfect for saucing. Some of us stand at the market eating the Sun Golds like grapes or an Early Girl like an apple. Others kick their heels together in joy because they have the perfect excuse to make BLT sandwiches several nights a week. Tomato season in Minnesota begins in mid-July and goes through early October.