Editor's note: Steve Reynolds' recipe and introductory text below are excerpted from author Diana Henry's book The Gastropub Cookbook, a guide to more than 150 dining pubs in Britain and Ireland. Chef Reynolds also shared some helpful cooking tips exclusively with Epicurious, which we've added at the bottom of the page.
This combination has now become a bit of a classic, but Steve has put his signature on it with the mint oil. You must use the oil on the same day it's made or the mint will discolour.