Calories per serving 299   Serves 4   Preparation time 15 minutes, plus   chilling   Cooking time 6-8 minutes   Ingredients:   1 garlic clove, crushed   3 spring onions, finely sliced   1 Tbs pesto   2 Tbs chopped mixed herbs, such as   parsley,      tarragon and thyme   375 g (12 oz) minced chicken   2…