Ottolenghi's Paella/Dutch Oven?

I am not the world's greatest expert on paella, but I think that you might be better off using plain stainless steel or thin metal skillet, as it satisfies the requirements for a good paella pan and for crust formation (wide, shallow, with splayed sides and made of thin metal). To get nice socarrat, definitely do not stir the rice, and at the end of the cooking you can try increasing the heat a notch until you can get that toasty smell.