A roasting pan is a heavy pan with a thick base. It's specially designed for slow-cooking meat, stews, and sauces. Roasting pans are generally made of cast iron, which helps retain heat well.
What exactly the best roasting pan is depends on your cooking needs and preferences. Cast iron roasting pans, such as those from Le Creuset or Staub, are popular for their excellent heat distribution and long lifespan. They're ideal for slow cooking and retain heat for a long time. Stainless steel roasting pans, on the other hand, are better suited for quick heating and searing.
A good roasting pan has a thick base for even heat distribution and a well-sealing lid to retain moisture and flavor in the pan. Also pay close attention to the material and coating.