Rinse the potatoes well.
Place the clean potatoes in a deep, large pot and fill it with fresh water to cover the potatoes by a few inches.
Place over high heat. Once the potatoes start to boil, set a timer for 8 minutes. Once cooked, drain the hot water and run the potatoes under cold water or plunge into a bowl of cold water until the centers are cool.
Once cooled, you can start to shred. The best way I have found is to place teh box grater inside a big mixing bowl. Use the large holes on the shred side of the grater and shred the potatoes into the bowl. You can also use the grating blade on a food processor, or you can rice the potatoes.
You'll notice that you will have lots of potato skins after you shred each potato. Since potatoes are members of the nightshade family and chickens should not have them, I toss the skins into the compost bin.
If you choose to use the grater accessory on your food processor, the skins may grate into the pile or they may end up on top of the wheel ungrated. Either is ok. If they end up ungrated, dispose of them as above.
Once you have all your potatoes shredded, sprinkle in the spices and gently fold them in. For 5 pounds of potatoes, sprinkle in 1 ½ tablespoons of salt, 1 ½ tablespoons of ground black pepper, just a pinch of cayenne pepper powder, and 1 teaspoon of paprika. Adjust these amounts as needed.
Now is the time to add in some grated cooked brocolli or sweet potatoes or grated onion if you want.