6 cherry tomatoes, halved
1 garlic clove, finely sliced
½ small lemon, finely grated zest only (optional)
50g/1¾oz baby spinach leaves
½ tsp dried chilli flakes (optional)
75g/2¾oz dried wholemeal pasta shapes, such as penne
freshly ground black pepper
1 tbsp extra virgin olive oil
400ml/14fl oz vegetable stock, made with ½ stock cube
125g/4½oz cooked and peeled prawns, thawed if frozen