PERFECT HASH BROWNS

Steps:

• Grate potatoes on the largest hole on a box grater into a medium bowl. Cover with cold water and drain; repeat once or twice, until water runs nearly clear. Taking small handfuls at a time, squeeze all the water from the potatoes and place in a dry medium bowl. Grate onion on the largest hole on a box grater and toss with potatoes. Season with salt and pepper.
• Taking small handfuls at a time, squeeze all water from the potato-onion mixture. Heat 2 tablespoons reserved bacon fat or vegetable oil in skillet over medium heat, add 1 tablespoon butter and swirl together.
• Add potatoes and onions and spread into a thin, even layer. Cook, without moving, until the potatoes are nearly cooked through and browned on one side, about 5 to 8 minutes. Using a spatula, flip sections of the potatoes to crisp on the other side. Add 1 tablespoon reserved bacon fat or vegetable oil and remaining 1 tablespoon butter and cook, without moving, until potatoes are browned on the other side, about another 5 minutes. Flip once or twice more (you don't have to be so careful here; just kind of stir them around) and continue to cook until most of the bits of potato are golden brown and crisped, about another 4 minutes.
• Transfer potatoes to a plate. Serve with hot sauce (or ketchup, if you wish).