I never had a yellow tomato at this homestead. This year a volunteer plant came up and since I hate to kill a plant I potted it up into a large pot. Well it had some pretty yellow tomatoes about four inch dia. with small ribs and flat about 1 1/2 to 2 inches tall. If you shut your eyes it tasted like a red tomato. Was white inside after it got real ripe, would turn pale yellow inside. Out side skin was a real bright yellow. Can not understand where this thing came from or got here. Saving a few seed if any friends would like some send a email.