Lots of character to this place — hand-lettered signs, orders shouted out loud — though too much self-awareness of their reputation for burgers, frappes, and lime rickeys, and a bit too much attitude. I don't know just what's in grapenut custard ($2.99) — it might simply be grape seeds, although many recipes call for the cereal of the same name — but I like the pleasant flavor and the scattered, slightly grainy pockets of "nuts," wherever they come from.
Mr. and Mrs. Bartley's Burger Cottage
1246 Massachusetts Ave., Cambridge
617-354-6559