Instructions

1. Preheat the oven to 350°F. Line a baking sheet with parchment paper and set aside.
2. To a small pot, add the potato and enough cold water to cover; bring to a boil over high heat and cook until the potato is tender when pierced with a knife, 13–15 minutes. Drain, and let cool. When the potato is cool enough to touch, coarsely mash with a fork and set aside.
3. Meanwhile, cook the fish: Set the fillets on the baking sheet, transfer to the oven, and roast until the fish flakes easily, about 15 minutes.
4. Pour the bread crumbs onto a plate and set aside. Remove the fish from the oven and cool slightly. In a large bowl, break the fish into chunks. Add the mashed potato, parsley, scallion, sour cream, and cayenne; mix well, then season to taste with fresh lemon juice, kosher salt, and black pepper. Form the mixture into eight patties, then roll each in bread crumbs.
5. Line a platter with paper towels and set by the stove. To a heavy skillet over medium-high heat, add the oil. Once hot, add the fish cakes in batches and cook, turning once, until golden brown and heated through, 3–4 minutes per side. Transfer the cakes to the platter and serve hot, with green tomato chow-chow, if desired.