Typically the corned beef hash I make is with the leftovers aftr a corned beef and cabbage meal (not only around St. Pats Day, but 4-5 times a year). I make sure I make extra corned beef, and prepare extra potatoes for the corned beef hash to follow.
My recipie:
I grind the corned beef up in one of those old time meat grinders with the large handle.
I use leftover cooked potatoes that have been refrigerated, and cut into cubes.
I also use a diced red onion, and minced garlic.
In a Cast Iron pan over medium heat, I place a mix of butter, and some veg oil, and saute the onions, and the garlic. I then add the ground corned beef, and then the potato cubes. I heat the mixture trying to get some light browning of the potatoes, and corned beef. I season with ground black pepper and the hash is complete.
A favorite for breakfast, or a meal in itself.