Heat oil in a large deep frying pan over medium-high heat; cook chicken, in batches, for 2 minutes or until browned all over. Remove from pan.
2 Add onion and capsicum to same pan, reduce heat to medium; cook, stirring, for 5 minutes or until onion softens. Add curry paste to pan; cook, stirring, for 2 minutes or until fragrant.
3 Return chicken to pan with stock, the water and tomato; bring to the boil. Reduce heat; simmer, uncovered, for 3 minutes or until chicken is cooked through. Remove from heat; stir in yoghurt.
4 Make cauliflower rice: Process cauliflower until finely chopped and resembles rice. Place cauliflower in a large frying pan over medium heat; cook, stirring occasionally, for 10 minutes or until just tender. Season to taste.
5 Make cucumber salad: Using a vegetable peeler, slice cucumber lengthways into long, thin ribbons. Combine cucumber and mint in a medium bowl.
6 Top chicken with extra yoghurt and mint sprigs. Serve with cauliflower rice and cucumber salad.