Place the Yopokki rice cakes in a bowl and cover with warm tap water. Let them soak for 5–10 minutes while you prep the other ingredients. This helps them cook evenly and reach a chewy-but-tender texture.
1 pack Yopokki rice cakes with sauce
Thinly slice the onion, green onion, cabbage, and fish cakes (if using). Cut the boiled egg in half. Measure the water, soy sauce, sugar, gochujang, and sesame oil so everything is ready before you start cooking.
1/2 cup water, 1 teaspoon sugar, 1 to 2 teaspoons gochujang (Korean red pepper paste), 1 teaspoon soy sauce, 1/2 teaspoon sesame oil, 1/4 small onion, 1 green onion, 1/4 cup shredded cabbage or napa cabbage, 1/4 cup sliced fish cakes (eomuk), 1 hard-boiled egg
In a medium nonstick skillet or small saucepan, add 1/2 cup water, the Yopokki sauce packet from the pack, soy sauce, and sugar (if using). Cook over medium heat, stirring, until the sauce dissolves and looks smooth. Whisk in the gochujang, if using, until fully incorporated.
1/2 cup water, 1 teaspoon sugar, 1 to 2 teaspoons gochujang (Korean red pepper paste), 1 teaspoon soy sauce
Drain the soaking rice cakes and add them to the pan with the sauce. Stir to coat each piece. Cook over medium heat for 5–7 minutes, stirring every 30 seconds or so. The sauce will start thin, then thicken and cling to the rice cakes. If it gets too thick before the rice cakes are tender, add 1–2 tablespoons of extra water at a time and continue cooking until the center is chewy but not hard.
1 pack Yopokki rice cakes with sauce, 1/2 cup water
When the rice cakes are almost tender, add the sliced onion, cabbage, and fish cakes. Cook for another 2–3 minutes, stirring often, until the onion has softened slightly but still has a bit of bite. Taste the sauce and adjust with more sugar, soy sauce, or gochujang as needed.
1 teaspoon sugar, 1 to 2 teaspoons gochujang (Korean red pepper paste), 1 teaspoon soy sauce, 1/4 small onion, 1/4 cup shredded cabbage or napa cabbage, 1/4 cup sliced fish cakes (eomuk)
Reduce the heat to low. Sprinkle the shredded mozzarella (if using) evenly over the top of the rice cakes. Cover the pan with a lid and let it sit for 1–2 minutes until the cheese is melted and stretchy. If you don’t have a lid, loosely cover with foil or allow the cheese to melt uncovered a bit longer.
1/4 cup shredded mozzarella or other mild melting cheese
Turn off the heat. Drizzle sesame oil over the top and gently swirl or stir to distribute. Top with the halved boiled egg, toasted sesame seeds, and sliced green onion tops. Serve immediately while hot and glossy, noting that the sauce will continue to thicken as it cools.
1/2 teaspoon sesame oil, 1 hard-boiled egg, 1 teaspoon toasted sesame seeds, extra sliced green onion tops
For leftovers, add 1–3 tablespoons of water to a small skillet with the Yopokki. Warm over low to medium heat, stirring occasionally, until the sauce loosens and the rice cakes heat through, 3–5 minutes. Or microwave with a splash of water, covered, in 30-second bursts, stirring between each.
1/2 cup water