Oysters.
If oysters ain't allowed, I'm converting.
Seriously, my first experience one-on-one with Messianic Jews was a conductor on a train in CA and his, um, partner, fiancee, wife? They were very clear on what scum the Catholics are, until I gently let him know that he was dissing the paying passengers, that I was willing to hear, but not to be gratuitously insulted, not on MY nickel
But my impression is that Judaism as much rejected us as we them. Now some, whose fathers abandoned the early Jewish converts when they declared with their lips and believed in their hearts that Jesus was Lord, are coming two thousand years later to the Gospel and telling us we're doing it all wrong -- or, maybe, that we're doing it all right for pig-eating Gentiles, but that being blood descendants from Abraham entitles them to tell us how very wrong and inferior we and our practices and dogmas are.
It's cute, it's interesting, but it's not persuasive. As always, one tries to overlook the insult and garner what is good. Certainly the OT is undervalued. Almost all the good stories (except for the very best one) and poetry are there.