Take your egg yolks and put them into your blender.
Add in the salt, lemon juice and hot sauce. Turn on the blender and blend until smooth.
Melt the butter in the microwave until steaming hot.
Turn on the blender and while the blender is mixing the eggs, very slowly pour the very hot butter into the eggs, until it's all incorporated.
You will now have hot, delicious Hollandaise ready to go!
Melt the butter and get it as hot as you can get it so that it helps to cook the eggs in the blender. Having all of the ingredients ( excepting the butter) at room temp will ensure that you get the hottest sauce possible. Using cold eggs will make the sauce too cold.