Round tomatoes have between five and seven locules or seed pockets but plum tomatoes like the San Marzano have two. This small seed cavity allows the seeds to be scooped out easily, leaving all the meat.
The plant can bear up to 12 bunches of fruit, the skin has a bright red color and is easily removable, an indispensable characteristic for preparing peeled tomatoes.
All in all, this type of tomato is considered one of the best available!