Instructions

1. 1
   Melt the butter in the microwave or on the stovetop in a small saucepan.
2. 2
   Pour a small amount of water into a medium-sized double boiler, making sure the water does not touch the bowl (put bowl off to the side). Bring to a simmer over medium heat, and reduce the heat.
3. 3
   Place egg yolks and the dry and liquid ingredients into the bowl and whisk for 1–2 minutes.
4. 4
   Gradually add the melted butter a little at a time, and whisk until the butter is well incorporated and mixture expands.
5. 5
   Place the mixture over the simmering water and whisk for 3–5 minutes, until the mixture is thick enough to coat the back of a spoon.
6. 6
   If the mixture become too thick or separates, add very small amounts of hot water until corrected.