Merguez lamb kebabs

Name: Merguez lamb kebabs
Ingredients: 2 tbsp cumin seed; 2 tbsp coriander seed; 2 tbsp fennel seed; 1 tbsp paprika; 2 tbsp harissa, plus extra to serve; 4 garlic cloves, finely minced; ½ tsp ground cinnamon; 800g lean minced lamb; freshly chopped coriander and flatbreads, to serve; 3 carrots, coarsely grated; 2 tsp cumin seed, toasted; 200g pot Greek yogurt; small handful chopped coriander; small handful chopped mint