1
Heat the oil in a frying pan (skillet) and gently fry the spring onions (save a handful to garnish), carrot and garlic for 5 minutes until tender. Add the minced beef and increase the heat to brown all over.
2
Add the sugar, soy sauce, sesame oil, rice vinegar, gochujang and a splash of water and bubble gently for 20 minutes, adding a splash more water if it starts to get too dry.
3
Meanwhile, put the cucumber and chilli in a bowl. Pour the vinegar into a small pan with the same amount of water and the star anise and sugar. Heat until the sugar has dissolved, then pour the hot pickling liquid over the cucumber and chilli and set aside for at least 10 minutes.
4
To make the burger sauce, mix the gochujang and mayonnaise until combined.
5
Spread with the gochujang mayo, toast the brioche buns. Fill with the sticky mince. Scatter with the remaining spring onions, top with the pickled cucumber, toasted sesame seeds and serve.