fun on a bun

There were picnic tables set up on the factory's sprawling front lawn, so we each ordered a mushroom burger topped with caramelized onions and grainy mustard on a bed of baby greens. Not exactly fun on a bun, but surprisingly delicious.

J. J. Brass, I Spy a Courtyard Casanova And when Rexy told me an old friend lives right downstairs I thought, well isn't that fun on a bun? When I'm travelling the world, just me and my camera, Rexy won't get too lonely.