If your slow cooker has a sear function, heat a little oil in it (or use a frying pan). Add the chopped onion and cook for 2–3 minutes until softened. Stir in the beef mince and cook until lightly browned.
Stir in the hoisin sauce, sweet chilli sauce, dark soy sauce, ginger puree, garlic puree, chopped chilli, and spring onions.
Cover and cook on low for 2–3 hours, or until the mince is rich, sticky, and slightly caramelised. If cooking on the hob, reduce the heat and simmer for 10–15 minutes, stirring occasionally, until thick and glossy.
Combine the cucumber, sliced chilli, sesame seeds, sesame oil, light soy sauce, rice vinegar, honey, and chopped spring onion in a bowl. Toss well.
Spoon cooked rice into bowls, top with the sticky chilli mince, add a generous serving of cucumber salad, and sprinkle with extra spring onion.
