I have been trying to get hash browns and American fries just right for a long time. I don't think par cooking hash browns is needed. One of the keys to hash browns it to get as much water out of the potato's as possible. The other key is the temp of the pan or griddle and the type of fat used. The closest I've come to matching my favorite diner hash browns is to start with Simply Potato hash browns. Spread them out on a dry kitchen or paper towel with another on top and squeeze any moisture out of them. Simply Potato's don't have much to start with. Heat a cast iron pan on just under medium heat when it's up to temp add some clarified butter. Must be clarified or it will burn. When the butter has reached temp add your hash browns. Spread them out but don't flatten or try to smash them down just a nice even layer. Don't touch them for five minutes.
After five minutes and the edges are just starting to crisp up season the top with whatever seasoning you like and then flip them over. Cook for another five or so and you should have some darn good hash browns.
The secret to American fries is par cooking ahead of time. Whenever I'm running the smoker I will add a five pound bag of red potato's if I have room and smoke them until about half done. Remove them let them cool and store in the fridge for later use. When ready for american fries I will cube them up. Then deep fry for three to four minutes tops. If deep frying is not a option you can shallow fry them in a pan with as much oil as you can safely use. Crispy out side and tender creamy inside. If you haven't par cooked potato's in your smoker you are missing out.
Perfect scrambled eggs you ask? Well you didn't but I'll give you some tips and what has worked for me. I will only eat eggs scrambled, deviled or hard boil by the way other than that the chicken can keep them. Scrambled your eggs in a bowl and add a pinch or two of salt whisk the salt in and let them sit at least fifteen minutes or longer. This is the first thing I do when starting to prepare breakfast. After they have sat with the salt long enough add a tablespoon or two of milk or cream and whisk that in. Lastly whisk in a tablespoon or so of club soda. Add a tablespoon of butter to a cast iron pan on medium low heat. Pour in your eggs. Let them sit until you see the eggs are firming up on the edges. Take a spatula and slowly start to pull the eggs from the edge of the pan to the middle of the pan. Resist beating the eggs up too much. Just keep folding from the edges to the middle. When they are almost done remove from heat. They will finish up nicely in the cast iron.
Ok now I'm hungry and time to start breakfast!