Begin by heating the sesame oil in a large skillet over medium-high heat. The sesame oil is the secret to that authentic Korean flavor - it's worth having a bottle in your kitchen.
Toss in the minced garlic and sliced onion, and let them sauté until the onion is soft and translucent. The aroma will start to fill your kitchen, and that’s when you know good things are happening.
Next, add the Korean fish cakes to the skillet. Stir and watch as they get a lovely, light golden crust, about 3 minutes.
Time for color! Throw in the red and green bell peppers and keep everything moving in the skillet for another 2 minutes. We want those peppers crisp, not soggy.
Now, lower the flame to medium. It’s sauce time! Add the soy sauce and sugar, stirring well to coat every piece with the glossy, savory sauce.
After about a minute more, everything should be beautifully caramelized and ready to serve.
Plate your fish cake stir-fry hot, and for the final touch, sprinkle over some sesame seeds for that extra nutty crunch.