When you cut the top off the inside is pretty empty and the seeds all grow in a cluster attached to the top of the tomato like bell peppers do. It has bumps on the bottom to help it sit upright when stuffed.
I wanted to show you the tidy group of seeds which pretty much came out by cutting a couple membranes. They have the nice mild flavor that most yellow tomatoes have. If you like stuffed tomatoes filled with cold salads or baked, you might want to consider planting some of these tomatoes next spring.
Have a happy day:@)