Prawn orzo saganaki style

Name: Prawn orzo saganaki-style
Ingredients: 2 tbsp olive oil; 1 large onion, finely chopped; 5 garlic cloves, finely chopped; 1 tsp chilli flakes (optional); 2 tsp dried oregano; 2 tbsp tomato purée; 200ml white wine; 2 x 400g can cherry tomatoes; 300g orzo; 500ml hot chicken stock; 350g raw king prawns; small handful of parsley, finely chopped; 50g feta, crumbled; ½ lemon, cut into wedges; 4 slices (90g) ciabatta, toasted