Consider 20-15: Vary the Butter Sauces to be the advanced version of 20-13: Béarnaise and Hollandaise Sauces. There’s probably something that bridges the two better (whatever 20-14 is, but I don’t have that card in my collection), so 5-4: Eggs Benedict will have to do. This set of recipes is part of the Cooking School, the back section of Simply Delicious that provides instructions in basic techniques, ingredients, and recipes that any skilled cook should be familiar with.
Like I said in 20-13: Béarnaise and Hollandaise Sauces, Hollandaise and its variations comprise one of the five mother sauces, a big part of French cuisine. Mastering it (and the others) is one of the marks of an accomplished and talented chef. I’ve always appreciated a well-made butter sauce, and these variations are intriguing–I’d be interested in eventually trying each one out.