Cheese and Potato Rissoles

1 . Stage

Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, about 20 minutes. Drain potatoes and mash in the bottom of the pot until no lumps remain.

2 . Stage

Place the pot over low heat. Stir butter into mashed potatoes; cook, stirring constantly, until butter has melted and potatoes are no longer moist. Spread potatoes into the bottom of a wide bowl and refrigerate until cooled completely, at least 30 minutes.

3 . Stage

Beat egg yolks into cooled potatoes; season with salt and white pepper. Stir Cheddar cheese and diced onion into potatoes. Shape potato mixture into tennis ball-sized spheres, arrange into a baking dish, and refrigerate until chilled thoroughly, at least 1 hour.

4 . Stage

Beat eggs and water together in a bowl. Spread flour and bread crumbs into 2 separate wide bowls.

5 . Stage

Gently roll potato balls in flour to coat and shake to remove excess flour. Dip each into beaten egg, turning to coat. Press each egg-coated ball into bread crumbs, again turning to coat on all sides. Gently toss between your hands so any bread crumbs that haven't stuck can fall away. Place breaded balls onto a plate while breading remaining potato balls; do not stack.

6 . Stage

Heat oil in a deep fryer or large saucepan to 375 degrees F (190 degrees C).

7 . Stage

Deep-fry potato balls in batches in hot oil until golden brown, about 5 minutes. Add more oil and return to 375 degrees F (190 degrees C) between batches. Drain fried balls on a plate lined with paper towels.