Harvested a bowl of my volunteer tomatoes, and was reminded of an article I read a while back, about the uneven ripening gene and its relation to tomato sweetness

Science - How Tomatoes Lost Their Taste

Turns out these green shoulders are a result of the same gene that controls the amount of sugar present in ripe fruits. When farmers selected for a mutation that produced uniformly red tomatoes, they sacrificed flavor.

[Image description: a hand holding a glass bowl stuffed with red plum and cherry tomatoes. Most of the plum tomatoes have splashes of green on their tops and shoulders.]