Crawfish boil is a delicious main dish believed to have originated in America. Crawfish boil is essentially prepared during Lent which is just after Mardi gras. A very popular dish, this dish is an integral part of the American holiday season. Very popular among kids, this dish is also one of the oldest American dishes. The main ingredients used to make Crawfish boil are crabs, potatoes, corn, Cajun smoked sausage and onions. Often lemons are added to this dish to make it even more sumptuous.