Combine flour and butter in a food processor, or by hand
Chop the cooked corned beef
Cook onions in oil and butter until softened
Mix the corned beef with the cooked onions and mashed potato
After resting, roll out pastry
Bake the base of the pie crust
Fill the pie crust base with the corned beef mix
Add the top part of the crust
Add a Shamrock for St Patrick's Day ☘️
Bake and enjoy!