Fragrant curried mince with tomato salad

Name: Fragrant curried mince with tomato salad
Prep time: 20 min
Cook time: 40 min
Total time: 40 min
Yield: 6 portions
Ingredients: 100 g natural yoghurt; 20 g oil; 300 g brown onion; 2 garlic cloves; 4 cm piece fresh ginger; 1000 g beef mince; 20 g tomato paste; 1 tsp chilli powder; 2 tsp garam masala; 1 tsp ground cumin; 2 tsp ground coriander; ½ tsp ground turmeric; 1 - 2 tsp salt; 100 g water; 2 tomatoes; 1 continental cucumber; ½ tsp dried mint; ½ tsp salt; 2 pinches ground black pepper; fresh green chillies; roti