For the record: you basically take a stick blender, the container that came with it, crack an egg, pour over some lemon juice, then blend while pouring in hot butter (use the microwave!). Takes ca 2 minutes, including the 1 minute 30s of microwaving the butter.
Instant _real_ sauce hollandaise as the stick blender creates a vortex that emulsifies it. No need to hand whisk it over a bain-marie at careful temperatures.
Why? A cheap probe ultrasonic mixer is $500 on Amazon, small, and would take forever. An immersion blender is $17 at Walmart and does it in seconds for a half-liter of mayo or hollandaise. If you need more than 500 mL of mayo but can’t just do a few batches, you are no longer in the realm of cooking at home.
If you want to do molecular gastronomy stuff, have fun, but it isn’t ever going to be a mass-market thing.
Instant _real_ sauce hollandaise as the stick blender creates a vortex that emulsifies it. No need to hand whisk it over a bain-marie at careful temperatures.