Why do you think you're pooping the party? I look for Kosher places.
I wasn't pleased with Gam Gam in Venice. But then my pejorative views on eating in Venice are matters of public record.
For Rome, I don't know if Sora Margherita Piazza della Cinque Scole 30 (tel 06 686 40 02) is Kosher. What most definitely IS Kosher is La Taverna del Ghetto, via del Portico d'Ottavia, 8 phone: 06 6880 97 71 or 0t 68212309 Closed Friday Night and Saturday at lunch, as you would expect. Even the wine is Kosher, and if one of the unwashed wants cream for his coffee or cheese, he'll get soy.
I ate here last Nov 2004 for dinner ("lunch" for y'all Yankees) just arriving in Rome after along flight. I sat outside at a table next to the curb. A Italian gentleman at the adjoining table asked me in English if he may smoke. Myself from the town that got rich from tobacco, I didn't refuse. He in turn told me the result of the American election. At the next table were a group of Israelis, skull cap on head. Try the Jewish artichokes.
I suppose you know already that Rome has its own Jewish rite along with the Sephardic and one Ashkenazy synagogue. Try the Central Synagogue. Venice is all Ashkenazy, as far as I can tell.