The Undertaker And His Pals(1966)
An undertaker and his two friends, who are restaurant owners, drum up business by going out on the town and killing people; the restaurant owners use parts of the bodies for their menu, and the undertaker gets paid by the families to bury the remainder. Their racket goes awry when 2 detectives suspect that something isn't quite kosher.
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This is the theatrical trailer for the movie, clipped at the end.