The sausage texasflower is referring to is not a shaped sausage, sold in casinings. It is seasoned ground pork and is sold in packages. American cooks either fry it in patties to accompany eggs at breakfast, or crumble it and pan fry it to make sausage gravy.
Thanks for the food education. We also have custard how you describe it, we call that baked custard or egg custard.
The custard that we use for a sauce is bascially corn flower with vanilla flavouring which we add milk and sugar to, bring to the boil and cook for a few minutes.