Chorizo - Heat 1 tbsp oil in a 30cm / 10" paella pan or large skillet over high heat (Note 9). Add chorizo and cook until browned on each side (~ 3 minutes). Remove with a slotted spoon and set aside.
Squid - Add squid and cook for 45 seconds on each side, then remove and set aside.
Garlic, onion, capsicum - Add remaining oil (if needed). Add garlic and onion, cook for 2 minutes. Add capsicum, cook for 1 minute.
Chicken - Add chicken. Cook for 2 minutes until lightly browned but still raw inside.
Add Rice - Add rice and mix until the grains are coated in oil.
Cooking broth - Add in most of the chorizo (reserve ¼ for garnish), chicken stock, fresh or crushed tomato and saffron. Stir.
Simmer 1 - Bring it to a simmer then adjust heat so it's simmering fairly gently (not super rapidly, will burn rice). Simmer for 10 minutes - no stirring! At this stage, a bit of rice should be poking through to the surface but there should still be plenty of liquid.
Add peas, prawns and mussels - Scatter over peas, squidge the prawns and mussels into the rice (partial submerge is fine).
Simmer 2 - Cook for 8 minutes (turn prawns halfway if you think it's necessary) or until prawns are opaque, mussels are open, and most of the liquid has been absorbed but still a bit liquidy. Discard any mussels that do not open. Remove from stove.
Check rice - Do a taste test to see if the rice is cooked - it should be firm but cooked. If it is too firm for your taste, no stress, just add a splash of hot water (not too much!) and keep cooking.
Rest - Scatter over squid and reserved chorizo (residual heat will warm through), cover with lid then rest for 5 minutes (rice will absorb remainig liquid). Paella rice should now be tender but "juicy", not stodgy and thick (if it is, add splash of water to loosen it).
Garnish - scatter with parsley and wedges of lemon. Take to table as is, then mix up rice with seafood before serving!
