Thread one half hot dog onto a wooden skewer, cut-side facing upward. Place one mozzarella piece directly on top so it sits flush against the hot dog's cut end — the mozzarella should cap the skewer without any skewer tip exposed above it. Repeat for all 12 skewers. Place the assembled skewers on a baking sheet and refrigerate. Cold skewers are not optional — the temperature differential between the cold filling and the warm batter is what makes the batter adhere cleanly on contact rather than sliding off.

Add the 6g of instant yeast to the 360ml of warm water at approximately 37°C — warm enough to activate the yeast but not hot enough to kill it. Whisk briefly to combine. In a large bowl, whisk together the 340g of flour, 4g of salt, and 60g of sugar until evenly distributed. Pour the yeast-water into the flour mixture and whisk until completely smooth with no lumps remaining. Cover the bowl tightly with plastic wrap and allow to rise at room temperature for 30 minutes. After 30 minutes the batter should have increased slightly in volume and will show small bubbles across the surface — the yeast activity that makes this batter specifically lighter and slightly chewier than a standard unleavened corn dog coating.

Place the diced russet potatoes in a saucepan and cover with cold water. Season generously with salt. Bring to a boil and cook for exactly 2–3 minutes — the potatoes must remain firm rather than tender. They are being par-boiled for adhesion, not eating; fully cooked potatoes will break apart when rolled onto the battered skewer rather than adhering as distinct cubes. Drain immediately and spread in a single layer on a baking sheet. Refrigerate until fully cold. Cold potatoes adhere to the battered surface more effectively than warm ones — their firm, cold surface grips the batter and holds in place during the panko-rolling step.

Fill a large, deep, heavy-bottomed pot just over halfway with the vegetable oil. Heat to 175°C. Set a wire cooling rack over a baking tray alongside the pot for draining. Maintain the oil temperature actively throughout frying — cold corn dogs entering the oil drop the temperature significantly and the heat must be raised immediately to restore it before the next batch.

Pour the risen batter into a tall glass or jar — the tall, narrow container allows each skewer to be dipped and coated in a single motion by submerging vertically. Place the chilled diced potatoes in a shallow tray alongside the batter. Place the 200g of panko breadcrumbs in a second shallow tray. Work quickly from this point — the batter, potato, and panko coating sequence must be executed while the skewers are still cold.

Remove the skewers from the refrigerator. Working one at a time, dip each cold skewer fully into the batter — submerging the entire hot dog and mozzarella section down to the batter line. Hold above the glass for 3–4 seconds to allow excess batter to drip off. Immediately roll the battered skewer in the chilled potato cubes, pressing gently as you roll to compact the potatoes into the batter surface. Work quickly so the potatoes contact the batter while it is still tacky — potatoes rolled onto dried batter will not adhere. Without delay, roll the potato-coated skewer in the panko breadcrumbs, twirling the skewer between your fingers to build an even, complete crust across the entire surface. Press gently to compact the panko into the potato layer. If at any point the batter appears to be sliding or loosening — a sign that either the skewer or the batter has warmed — return the skewers to the refrigerator for 5 minutes and place the batter container in the freezer for 3 minutes before continuing.

Hold each coated skewer by its exposed handle and lower it slowly and steadily into the 175°C oil. The moment the corn dog enters the oil, begin rotating the skewer continuously between your fingers — a constant, steady rotation that turns the corn dog slowly throughout the entire frying period. The continuous rotation is the technique that produces the smooth, even, domed Korean street-food shell. Without rotation, one side of the corn dog rests against the pot's bottom or wall, flattening and browning unevenly while the other side remains pale. Continuous rotation ensures every surface is in contact with the hot oil for an equal amount of time and that the batter sets as a symmetrical, smooth cylinder. Fry 1–3 at a time depending on pot size — never crowding. Fry for 3–4 minutes until deeply golden brown and uniformly crisp across the entire surface. Transfer each finished corn dog to the wire rack.

While each corn dog is still hot — within 30 seconds of leaving the oil — sprinkle very lightly with granulated sugar and a pinch of fine salt. The combination of hot surface, residual oil, and the slight crystalline crunch of sugar and salt is the specific Korean street-food finish that balances the richness of the mozzarella and the savoury coating with sweet-salty contrast. Do not skip this step and do not apply it once the corn dog has cooled — the salt and sugar adhere to the hot, slightly oily surface rather than falling off a dry cooled crust.

In a medium bowl, whisk together the 180g of mayonnaise, 85g of sriracha, 30g of gochujang, 25g of honey, 10ml of toasted sesame oil, and 20ml of rice vinegar until completely smooth and uniformly coloured. Transfer to a squeeze bottle for the specific controlled drizzle application characteristic of Korean street food presentation.

Drizzle each hot corn dog generously with the gochujang sauce in a zigzag pattern along its length. Serve immediately — Korean corn dogs are at their maximum textural quality in the first 3–5 minutes after frying while the mozzarella is fully molten and the crust is at peak crispness.