Well, in my case it was Pineapple mega bloom and there were 11 tomatoes fused in one .
I saved seeds just for fun, but there were not many. Taste was not good, sure not like Pineapple.
Some parts were overrippen and some parts in early stage of rippening. The only reason for growing was strange look and to see what will come out.
I am not sure, but the reason for mega bloom was, I guess, temperature changes last summer in my greenhouse at the time of forming flowers.