Farms that offer CSAs tend to grow more interesting things than you can get in a grocery store - often heirloom varieties. Take the classic heirloom tomato for example. It doesn't have a symmetric shape or uniform coloring but it tastes far better than any supermarket tomato. A true heirloom crop is one whose best seeds have been selected and replanted from the prior year's harvest for 50 seasons.
Looks weird, tastes great and is suited to the soil and climate conditions of that region.