iDouble Boiler:A double boiler looks like two saucepots, one inside the other. Food in the upper pot is heated by the boiling water in the pot below. Saucepan:A saucepan is a metal container of moderate depth, usually having a long handle and a tight cover. They are great for stewing, boiling and steaming vegetables.Saucier:Sauciers are very similar to saucepans but tend to be shorter and wider for easier stirring and whisking of sauces. Butter Warmer:Butter warmers usually have much larger proportioned rims in relation to the bottom of the pan than a sauté or paella pan would have. Butter warmers are typically no bigger than 1.5 quarts.