Heat half the oil in a 24cm (base) paella or deep frying pan over medium-high heat. Add chicken and cook for 3-4 minutes until light golden. Remove to a plate. Add remaining oil with the onion, garlic, paprika and chorizo, cook until soft.
Add rice, tomatoes and 2 ½ cups of the stock. Stir, then spread the rice evenly over the base of the pan and bring to the boil. Reduce heat to medium-low, simmer, uncovered without stirring for 10-15 minutes until almost all liquid is absorbed.
Stir in the chicken, prawns, capsicum, cabbage and remaining stock. Cover and cook for 5-10 minutes until the prawns turn pink.