Prep the radish: Peel the radish and slice it into thin matchsticks, about 2–3 inches long. Aim for even thickness so everything seasons evenly.
Salt and rest: Toss the radish with 1 teaspoon kosher salt.
Let it sit for 10–15 minutes until it releases some water and softens slightly.
Drain and squeeze: Pour off the liquid. Gently squeeze the radish by the handful to remove excess moisture without crushing the texture.
Make the seasoning: In a bowl, combine gochugaru, garlic, sugar, vinegar, fish sauce (or soy sauce), and sesame oil. Adjust sugar and vinegar to taste—you want a bright, balanced sauce.
Toss to coat: Add the radish to the bowl and mix well with your hands or tongs until every strand is evenly seasoned.
Stir in scallions and sesame seeds.
Rest briefly: Let it sit 5–10 minutes. The flavors meld, and the radish picks up color and tang.
Taste and tweak: Add a pinch more salt, sugar, or vinegar if needed. If you like more heat, sprinkle in extra gochugaru.
Serve: Plate as a side dish with rice, grilled meats, or noodles.
It also works as a crunchy topping for bibimbap or salads.