Heat olive oil in a deep 30cm-diameter frying pan over medium-high heat. Add onion and garlic, stir occasionally until golden (6-8 minutes), add tomato, chorizo and saffron and cook until thick (5 minutes). Add stock, Sherry and 250ml water and bring to the simmer, then add rice and stir occasionally until rice is almost tender (10 minutes). Add prawns and cook for 4 minutes, then add mussels and cook until just opened (5 minutes). Season to taste, scatter with parsley and and serve hot with lemon wedges.
This recipe is from the October 2012 issue of Australian Gourmet Traveller.