I also had an honorary Jewish "Bubbeh" - Grandma Letzie - from the year mid-59 to mid-60, I lived with an Orthodox Jewish family - who were friends of my employer and needed a Shabbos Goy while I needed a place to live close to work.
Her granddaughters were not much interested in cooking so I got the benefit of her expertise in several traditional recipes and learned the importance of maintaining order in TWO kitchens (separated by a butler's pantry) as they were strictly kosher.
Unlike many of her generation, Bubbeh Letzie had a wonderful way with vegetables which were not cooked to death, as in some traditions.
She had a deft hand with pastry and the strudels, especially the poppy seed and the prune, would bring tears to those who really appreciated them.
She taught me to make potato dumplings that were light and fluffy, so unlike the heavy ones so often found.
I just wish I had written everything down. I have a good memory but after 50-some years, a few things have been sifted out.