3 egg yolks
1 stick of butter (not margarine - won't work)
1 tsp lemon juice
1 drop dijon mustard
1 splash hot sauce
Melt the butter in a measuring cup that has a pouring spout.
Combine the egg yolks, lemon juice, mustard, and hot sauce in a blender and blend for about 5 minutes.
While the blender is still running, drizzle in the melted butter very slowly. Once all the butter is added, run the blender for another minute.