This is one of my "Green Zebra" tomatoes -- my new favorite. These are not heirloom tomatoes, per se, but are an open-pollinated variety. Once I finally figured out they were ripe (hint: it's when the fruit becomes slightly soft to the touch and the background color turns a yellowish chartreuse), I found them to be pleasingly tart-sweet, like salsa verde. They also look pretty cool sliced on a plate with dark red and orange tomatoes. Two (green) thumbs up.
"Green Zebra" tomato