6 cherry tomatoes, halved
1 garlic clove, finely sliced
陆 small lemon, finely grated zest only (optional)
50g/1戮oz baby spinach leaves
陆 tsp dried chilli flakes (optional)
75g/2戮oz dried wholemeal pasta shapes, such as penne
freshly ground black pepper
1 tbsp extra virgin olive oil
400ml/14fl oz vegetable stock, made with 陆 stock cube
125g/4陆oz cooked and peeled prawns, thawed if frozen