Langoustine and chicken paella

Name: Langoustine and chicken paella
Ingredients: 250.0 g mini cooking chorizo, sliced into thick chunks; 3.0 skin-on chicken breasts, each cut into 4 pieces; 400.0 g paella rice; 90.0 g jar chopped sweet onions; a large pinch of saffron; 0.5 tsp smoked paprika; 1.0 litre hot chicken stock; 125.0 g asparagus tips; 75.0 g fresh or frozen peas; 12.0 langoustines or shell-on jumbo king prawns, defrosted if frozen; a large handful of flat-leaf parsley, roughly chopped; lemon wedges, to serve