The beefsteak tomato has numerous compact seed cavities dispersed throughout it, and the core is practically nonexistent. Because of this internal structure, it holds together well when cut, and so is particularly well suited for slicing and eating raw. It is considered by many to be the ideal sandwich tomato.
Oni hana (= devil flower) is the first flower on the tomato plant. Onihana tomato is a tomato from the first flower, meaning there is only one onihana tomato from one plant. In general, the flowers will be pruned so that the tomatoes can be stronger, but they onihana tomato is the strongest and most nutritious.