The gluten- and dairy-free By the Way Bakery is making challah primarily from oat flour, under rabbinical supervision, so it’s kosher and pareve.

But to achieve certification by rabbinical supervisors as “pareve,” his doughnuts could not contain any trace of dairy products or meat.

Thus Genack concludes that, providing the animal is kosher and properly slaughtered, test-tube meat should be pareve—neither meat nor dairy.