Mushy peas are the quintessential side veg to accompany fish & chips in the UK. The traditional recipes use marrowfat peas, but more modern versions take advantage of the ordinary English spring peas you can find in any freezer case. This version was bright, refreshing, and while it does taste different from the marrowfat version, it is still quite good. This is also great served with with lamb. Adapted from Tom Aikens version, as seen on Market Kitchen.