MC Fat ..............

Bakewell PUDDING (which is almost as in your endo as TART). Obviously you never went into a cake shop in Bakewell and got away with either mistake!

poke is the diminutive of pocket (I am told) hence the "Pig in a Poke" which was probably a cat anyway. So a paper bag (originally a cloth sack on would presume) looks like it all fits neatly - except when you let the "cat out of the bag" (same reference).