Start by lighting the barbecue as normal. Meanwhile put a good pinch of saffron threads in a saucepan with a litre of chicken stock and bring it to a simmer. Once the flames have died down and the charcoal has a covering of grey ash, set the paella pan on the barbecue grid and heat a good slug of oil. Next add a finely chopped onion and a couple of cloves of chopped garlic and sweat them off, stirring for 5 minutes or so until softened and starting to caramelise. Then add 4 chicken thighs and once nicely browned add some sliced chorizo and a chopped red pepper. Once this is cooking sprinkle in the rice (about 300g), stirring until the grains begin to soak up the oil.
A note about the rice; the best rice for paella is bomba, a Spanish short-grain rice that is able to absorb three times its volume in liquid. When cooked, the grains remain separate and do not stick together. The rice in paella should be dry and separate when done, not creamy like risotto. Also, it isn't paella if it is made with long grain rice.
Finally add the hot stock and season, gave it a good stir.
Don't worry about the paella sticking or burning; it is authentic to have a crust or "soccaratis" (the caramelized crust of rice that sometimes sticks to the bottom of the pan) and this is the prize in a well-made paella.
It's done when the rice has absorbed all the stock and is just tender.
Delicioso!