Thai chicken balls with sweet chilli dipping sauce

Name: Thai chicken balls with sweet chilli dipping sauce
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: Asian, Thai
Ingredients: 3 long red chillies, cut into halves and deseeded, if preferred; 60 g water; 60 g rice wine vinegar; 60 g raw sugar; 1 tsp salt; 2 garlic cloves; 1 fresh red chilli, cut into halves and deseeded, if preferred; 2 garlic cloves; 6 sprigs fresh coriander, leaves only; 2 spring onions/shallots, trimmed and cut into halves; 20 g oyster sauce; 1 tbsp self-raising flour; 1 tsp salt; 30 g red curry paste (see Tip); 80 g coconut milk; 500 g chicken mince; 500 g water; 1 cucumber, peeled into ribbons (optional); 20 g alfalfa sprouts (optional); 1 tsp black sesame seeds (optional)