Peel and dice the potatoes and add to a lightly salted pot of water. Bring to a boil and boil until when pierced with a fork the potato is soft. Roughly 30 minutes.

Pour olive oil onto a frying pan and turn on to medium heat. Sauté the onions for 8 minutes or until aromatic then add the garlic and saute for another minute.

Add the ground beef and season with salt and pepper. Fry until cooked thoroughly about 30 minutes. Drain the excess fat.

Add the can of corn and 2 cups of gravy to the cooked ground beef and pour into the bottom of a 9x13 dish.

Preheat the oven to 400℉/200℃/Gas Mark 6.

Remove the potatoes from the hob and drain. Mash them well and add 4 tbsp. of butter and 1/2 c. of whole milk and mix together. The potatoes should be smooth.

Spoon the potatoes on top of the beef evenly. Lightly cover with butter.

Bake in the oven for another 30 minutes or until the tops of the potatoes turn golden brown.

Remove, let cool, and serve!