TomN, I use San Marzano DOP all the time, perhaps a different grower.
I like to heat onion and garlic until onion is wilted, add hand crushed, or squished, tomatoes and season with EVOO, a bit of red vino and occasionally other herbs, both fresh and dried as soots the mood. The tomatoes are good all buy themselves however and the 1st recipe gives a good opportunity to taste the tomato.
Mark