Fresh from our garden.
San Marzano tomatoes originate from the small town of San Marzano sul Sarno, near Naples, Italy, and were first grown in volcanic soil in the shadow of Mount Vesuvius. One story goes that the first seed of this tomato came to Campania in 1770, as a gift from the Viceroyalty of Peru to the Kingdom of Naples, and that it was planted in the area of San Marzano sul Sarno.
Compared to the Roma tomato, San Marzano tomatoes are thinner and more pointed. The flesh is much thicker with fewer seeds, and the taste is stronger, sweeter, and less acidic.
According to Wikipedia, San Marzano vines are determinate, and have a somewhat longer season than other paste tomato varieties, making them particularly suitable for warmer climates. I will find out if this claim is true or not next year.