recipe-formats
One of the available recipie formats is the recipie markup language
Recipe Markup Language
It was (formerly known as DESSERT -- Document Encoding and Structuring Specification for Electronic Recipe Transfer) is an XML-based format for marking up recipes. The format was created in 2000 by the company FormatData.
The format provides detailed markup for defining ingredients, which facilitates automated conversions from one type of measurement to another. The markup language also provides for step-based instructions. Metadata can be added to a RecipeML document through the Dublin Core.
There are some software programs that read and write the RecipeML format. The most notable of these is Largo Recipes. The RecipeML license is fairly open.
RxOL
RxOL uses a postfix notation to represent Recipies.