San Marzano tomatoes, the exact name, are the most well known of the relatively few varieties that have the appropriate shape and size to be canned (as you are

San Marzano tomatoes, the exact name, are the most well known of the relatively few varieties that have the appropriate shape and size to be canned (as you are stuffing a fixed number of Whole tomatoes in a can, shape and size is very important) and they are really good for canning only in a limited part of the South, e.g. near Caserta.