Chef Jacob brought up an interesting subject for me, what are SAN MARZANO tomatoes?
San Marzano tomatoes are a product protected name from France, as I remember. This would be like the protected name of a wine from France or a Valdala onion from Georgia with low sulfur content. I could not grow a Georgia onion because my soil content is too high in sulfur.
So what is a San Marzano tomato from France? It is a plum tomato with medium acid content with high meat content, 2 seed cell tomato with low moisture content. The tomato is also a heirloom tomato which will self pollinate, which means you can save the seed from the the tomato to grow next year.
Since I grow my own tomato plants, San Marzano tomato seed did not produce as heavy a crop compared to other plum plum tomato compared to hybrid or heirloom tomatoes in my area.
I believe that 2 cell seed cell plum tomatoes are grown, in California, in the US but the spelling of the tomato is changed slightly because of product protection.
If your grow or buy plum tomatoes, look for the key word of high meat content.