Do any restaurants or stores in the metro New York/ New Jersey area sell/ or serve kosher meat knishes? I never see them anywhere. I get them all the time at Rubins in Brookline, MA, but have not seen them much places elsewhere.
Epsteins Deli in Westchester has meat knishes - 2 locations on Central Avenue. Also - there is a deli on Main St. in Fort Lee that used to have them. Usually these are filled with combo of ground turkey and corned beef.
I've seen hot dog knishes at a bunch of kosher restaurants. It's usually a potato knish with a hot dog through the middle. I'm not sure if that's what you're looking or more of a ground beef/deli filling.