I recently received a comment from reader that they made the tomato sauce and added the 1 tablespoon of salt that the recipe calls for. After tasting the sauce, they found it too salty. My reader went on to say that they added a can of tomato sauce to dilute the saltiness. Placing a piece of raw potato in something such as soup, and perhaps tomato sauce, will absorb the salt. 

Please note, that the recipe I posted was as it was written in "Naples at Table." In the future, I will make note of any adjustment I've made to a recipe which I think you may find helpful. When I make fresh tomato sauce, I use 1 teaspoon of salt; then adjust accordingly.