Prepare your ingredients: Finely dice 1/3 cup onion. Finely chop 1/4 cup spring onion white parts. Roughly chop 1/3 cup kimchi into smaller pieces. Drain 100g canned tuna and break up with a fork. Measure out 1 tbsp red chilli powder and 1/2 tsp sugar and set next to the stove. Break up any clumps in your cooked rice before cooking.
Fry the onion and spring onion: Heat 1 1/2 tbsp cooking oil in a wide pan over medium-high heat. Add 1/3 cup diced onion and 1/4 cup chopped spring onion white parts. Stir-fry for 1-2 minutes until softened.
Add the kimchi and fry: Add 1/3 cup roughly chopped kimchi into the pan. Stir-fry over medium-high heat for 1-2 minutes, stirring and tossing frequently.
Add the tuna and spices: Add 100g drained canned tuna, breaking it into smaller pieces as it goes in. Add 1 tbsp red chilli powder, 1/2 tsp sugar and salt to taste. Stir-fry for about 1 minute.
Add the rice and stir-fry: Add 1 bowl of cooked rice all at once. Stir-fry over medium-high heat for 2-3 minutes. Taste and adjust salt if needed.
Finish with sesame oil: Turn off the heat. Drizzle a generous amount of sesame oil over the rice and toss everything together one final time.
Fry the egg and assemble: Crack 1 egg in and fry one-sided until the white is fully set and the edges are lightly golden but the yolk is still completely runny. Spoon the fried rice into a bowl. Place the one-sided fried egg on top in the centre. Scatter white sesame seeds generouslyand finish with crumbled or sliced seaweed. Serve immediately.