I was looking at some old posts on this board and I noticed a September inquiry about Kenyan/Tanzanian restaurants. I don't know of any, don't think there are any, but Meskerem on West 47th St. between 9th and 10th Avenues does have excellent Kenyan-style meat samosas. Meskerem is Ethiopian and there have been some posts here about it. It's excellent and I have had many a satisfying meal there, but the samosas are the only item I would characterize as also Kenyan/Tanzanian. Just ask for some cut-up lime to squeeze on the samosa after you've bitten off the corner and you'll be snacking in Kenyan style!
(Kenyan samosas differ from Indian samosas in that the crust is crispier, not like pie dough, they are shaped like a 2-dimensional triangle rather than a three-dimensional one, the ground meat/onion mixture usually does not have peas or Indian spices, and they are eaten with lime wedges. They are extremely addictive).