Egg yolks? Substitute- I don't think so... but if you have a lot of yolks why not make a Hollandaise, then add some tarragon to make Bernaise, then a nice Chateau Briand to go with it? Roasted new potatoes, asparagus on the side, and a nice Pinot Noir to go with it all.
See what a few egg yolks can lead to?
Favorite Quote: "Time Flies Like an Arrow - Fruit Flies Like a Banana"