Peel and shred (larger shred) the potatoes on a box grater or using a shredding attachment in a food processor.
1 lb russet potatoes
Add the potatoes to a clean dish towel and wring out as much water as possible.
Add the green onions, garlic, potatoes, salt and pepper, and egg to a large bowl and mix to combine. Add the cornstarch and corned beef and use a rubber spatula to fold it all together. Sprinkle the cornstarch all over the top to evenly disperse it.
½ cup green onions, 2 cloves garlic, 2 teaspoons kosher salt, ½ teaspoon black pepper, 1 large egg, ⅓ cup cornstarch, 2 cups corned beef
Heat a large frying pan over medium low heat until hot. Add the butter and oil and swirl until the butter melts.
2 tablespoons salted butter, ¼ cup extra virgin olive oil
Scoop out ¼ cup of fritter batter and form it into a patty with your hands (it won't stick together, just make it round) and add to the pan. Repeat with 3-4 fritters, making sure not to crowd the pan or allow them to touch.
Cook for 3-5 minutes until nicely golden brown, then flip and cook for another 3-5 minutes.
Transfer the cooked fritters to a wire rack and sprinkle with flaky sea salt. Place in a 200℉ oven to keep warm, if needed.
Flaky sea salt
Repeat with the remaining fritter batter. If the fat is all gone, add a bit more oil and butter and allow it to heat back up before adding more fritters.