As it was written in the 1920s
Shell enough shrimps to make 1 pint.
Melt 4oz butter in a clean pot and add a blade of Mace and a tiny pinch of Cayenne pepper.
Put in the shrimps and bake gently till quite hot, but not boiling.Remove from the oven and pack into small pots, leaving a little space on top.
When quite cold, pour in enough mutton fat or clarified butter, to make a half inch layer.
Store in a cool place.
Not sure about the mutton fat. I plumped for clarified butter. Tasted delicious on wholemeal toast.