I have heard of mayonnaise made with cooked yolks before, but was suspicious of it. Now a user posted another question with a link to a recipe which shows the making steps. It shows the making a mayonnaise with a hard boiled yolk, emulsifying 150 ml of oil with a single yolk (and as far as I can tell, no additional liquid - the text is in Romanian). The mayonnaise in the picture looks nicely emulsified and smooth.
How is boiled-yolk-mayo made? What is the best ratio? Should I follow a different method than with raw yolk? How different is the result from normal mayonnaise?
It's not an emulsion if there's not a liquid other than oil in the recipe. An emulsion is, by definition, a combination of two immiscible liquids such that droplets of one (the dispersed phase) are suspended in and surrounded by the other (the continuous phase). I don't read Romanian either, but there's got to be some sort of non-oil liquid in there, like vinegar, wine, water, or lemon juice.
I've heard of making mayo with cooked egg yolks. Harold McGee gives a recipe in On Food and Cooking for mayo made with yolks heated enough to pasteurize (or something close to it) but not completely cooked. Julia Child describes a technique for mayo and Hollandaise that involves cooking an egg with water and flour (I'd guess to keep the cooked egg smooth); see The Way to Cook, pg. 377. She says it "tastes just like the real thing," and claims that it's less susceptible to spoiling in warm weather.
The pictures you linked show a food processor, and it's a good bet that the high speed of the processor helps to break up the hard boiled yolk and make for a somewhat smooth sauce. It'd probably help to give the processor a head start if you crumble/mash the yolk with a fork first.
I would like to contribute though unfortunately I have no source material besides my own experience. I have come to this question from a search for what to call a sauce made from cooked egg yolk, water, and oil since most definitions of mayonnaise define it as an emulsion from raw eggs. You can make an emulsion using cooked yolk. I use the yolks from hard boiled eggs to make mine. I use a plain hand whisk for the mixing, adding oil and water a little at a time. I often use soy sauce as part of the water component. I remember the first attempt I was concerned when it seemed to have come together to a point but still had a grainy appearance when it finally crossed over that invisible line and turned into a creamy emulsion that looked and felt as smooth as any store-bought mayo.
I went ahead and tried it. I used hard-boiled yolks, as a soft and slimy one would be not really different from making the mayo in a waterbath. It turned out to be incredibly fickle.
The first try, only yolk and oil, with immersion blender, split immediately and never recovered. The second try was supposed to incorporate the bad emulsion. I first made a paste from the yolk with a few milliliters of lemon juice and water, then started adding the bad emulsion, beating with a mixer this time. I got a thick suspension of yolk particles in oil, but it wasn't emulsified.
The third try worked at first. Again, I started with yolk and water and lemon juice, and then added the oil in really tiny amounts, half a teaspoonful at once. I used the mixer again. It emulsified, but was runny. I kept adding oil, and it was a nice emulsion, but very soft, runnier than soft peaks, like a batter. And then, one of the teaspoons of oil broke the emulsion completely :(
I don't know how the emulsion in the picture is made, maybe the sources I have heard of forget to mention that the yolk shouldn't be hard boiled (mine was longer boiled than the one in the forum picture). If this is the case, then obviously there is nothing unusual happening here - the yolk retains some of its emulsifying power even after boiling (I suppose it is the lecithine), but many of the substances which are actively helping the emulsion when heated around 70°C don't work any more. So, working with cooked yolks is possible, but much harder than the normal heated raw yolks. Which makes me think that there is no reason to try further to use cooked yolks.
I can't comment on taste, didn't try the emulsion before it split. After splitting, the yolk-containing oil is still usable as a bread dip, but doesn't taste well enough to be made on purpose.
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