Sardines with tomato couscous

Name: Sardines with tomato couscous
Prep time: 15 min
Cook time: 55 min
Total time: 55 min
Yield: 4 portions
Ingredients: 8 fresh whole sardines; 1 lemon; 1 tsp salt; 200 g vine-ripened cherry tomatoes; 180 g couscous; 180 g brown onion; 2 garlic cloves; 1 ½ tbsp oil; 330 g boiling water; 1 tsp raw sugar; ¼ tsp ground black pepper; ¼ tsp dried chilli flakes; 100 g pitted black olives; 30 g caper berries; 400 g canned crushed tomatoes; 130 g water; mixed leaf salad