Peel the potatoes, then grate into a bowl. Using a clean tea towel, place the grated potato into the centre of the tea towel. Ring out as much excess liquid as possible, then transfer the grated potato back into the bowl.
To the potato, add the egg, flour, garlic, rosemary and seasoning. Stir well until fully combined.
Bring a large frying pan to a medium high heat, and cover the base with oil. Once hot, place heaped spoonfuls of the hash brown mixture and flatten to create a flat, disk shape.
Fry on each side for 2-3 minutes or until golden brown. Place in the oven to keep warm while cooking the remainder of the mixture. Serve fresh!