Harissa turkey burgers

Name: Harissa turkey burgers
Ingredients: 250g pouch mixed grains (or 250g cooked mixed grains); 500g lean turkey breast mince; 2 large garlic cloves finely grated; 1 tsp coriander seeds toasted and crushed; 4 tbsp rose harissa; small bunch parsley finely chopped; 2 red peppers; 150g rocket; 2 tbsp rapeseed oil; 1 lemon juiced; 3 cooked beetroot grated; 4 wholemeal seeded buns toasted, to serve; 1 medium courgette; ½ small bunch dill finely chopped; 4 tbsp fat-free Greek yogurt; 2 tbsp low-fat mayonnaise