Crab with spaghetti in a tomato and caper sauce on The Hairy Bikers Comfort Food.

The ingredients are: 100g pancetta, 1 tbsp extra virgin olive oil, 2 garlic cloves, crushed, 10 vine-ripened tomatoes, chopped, 1 x 400g tin chopped tomatoes, 250ml fish stock, 1 red onion, left whole, peeled and trimmed, ½ fresh green chilli, deseeded and chopped, pinch saffron, ½ tsp sugar, 500g dried spaghetti, 600g mixed cooked brown and white crab meat, handful chopped fresh parsley. 3 tsp capers, rinsed and chopped, knob of butter, salt and freshly ground black pepper.