Marinade: Take the Greek yoghurt and pour it into a bowl. Add the ground cumin, 1/2tsp paprika, dried chilli, lemon juice, salt, pepper and the scallions with the roasted garlic (roast garlic is made by placing a clove in the oven until it naturally pops out of its skin). Give all of these ingredients a stir so that they are mixed well. Place the breasts in the marinade and leave for at least 4 hours or preferably overnight. Vinaigrette: Put the mango, cucumber, spring onions, red chilli, red pepper and a dash of lemon juice in a bowl. Mix well, add some salt and pepper, sugar, coriander and some olive oil and mix again. Take a chicken breast, removing excess marinade and place on the griddle. The breast should be nicely marked on each side. Reduce the heat and cook the chicken through well for 12-15 minutes. You can transfer the breasts to the oven to finish cooking if a griddle is not available. To finish, pop the chicken on a dish and add the salsa.