A few years back, I was in London, and being hungry, stumbled into a shop that was selling pie and mushy peas. Thinking that it was some kind of clever play on naming a dish, like spotted dick or toad in the hole, I ordered it.
What I got was, well, what was described. A pie and mushy peas. The gravy was salty, the pie crust was okay, the filling forgettable. And the mushy peas were a grade above baby food. But you can't always have stellar experiences: this is probably comfort food for some folks.