I'm thinking about making a sauce for burgers. Requirements are the following:  Tastes of concentrated egg yolk - for me perfection is the taste of yolk in a fried egg For seasoning salt and pepper only should do the job, but I'm keen on trying some MSG Thick, almost mayo-like consistency  I've tried many hollandaise recipes, with double boiler or blender methods, but nothing quite satisfies me. Butter in those recipes  just weakens the taste. I also tried thickening with flour, however the texture change was unforgivable (maybe I messed this up somehow?) Honestly, I'm cool with just putting fried egg into burger, taste is great, however it's a bit too runny and messy to eat. I'm willing to try and report any ideas, I got like 50 spare eggs :) 
Not a recipe, but I will share a technique.  Using sous vide you can cook egg yolks to a consistency where they will behave like a sauce.  You separate the yolks, and drop them into a container of oil, which is being heated in a water bath.  Time and temperature determines consistency, which can range from runny to fudge-like (or hard boiled, but that is not what you are going for).  Fish them out, and place them on your burger. Season as you like. Here are more precise instructions. 