Into the bowl of a blender add in 4 egg yolks, hot sauce, mustard and lemon juice. Turn the blender on high and blend for around 20 seconds. After 20 seconds slowly stream in the melted butter into the blender with the motor still running. Don't rush this process.
Once butter has been slowly poured in, taste the sauce and adjust with salt or more lemon juice!
Enjoy!
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