Rule #1: get the right kind of potatoes
Rule #2: boil the potatoes the day before
Rule #3: use well seasoned cast iron
Rule #4: don't crowd the potatoes
Use two pans if needed. You should not have more than a double layer. Less is better.
Rule #5: Use enough butter or oil
Rule #6: have patience!
So there you have it. My favorite fried potatoes. They don't even need ketchup if done right and those of you who know me know that is saying something.