Halal

There are about 60 franchise stores left of the once dominant road trip stop, including one in rural Missouri offering a menu that is very different from the one Stuckey’s is known for but is meeting a growing need: biryani and halal burgers.

Wearing a heavy smock and rubber boots, Amadedin Eganwa stands over a large conveyor belt that’s carrying unconscious lambs. He faces east, towards...