LORELAI: I’m not eating alone. You’re here.
LUKE: I’m working.
LORELAI: Yeah but after three cheeseburgers you’re done, unless you’re expecting Elijah to stop by.
A reference to the biblical prophet Elijah, who God ordered to flee into a safe hiding place near a brook where he was miraculously fed bread and meat by ravens. After the brook dried up, God sent a widow to feed him: even though she had only a little flour and oil, by a miracle this small supply of ingredients never ran out.
Lorelai’s reference suggests she must have received some religious education as a child – unlike her earlier reference to Noah’s Ark, this isn’t a story familiar to nearly everyone.