1. Boil water in double boiler or sauce pan. Place glass bowl over top of sauce pan if using this method.
2. Place 1/2 cup butter in double boiler or glass bowl. Allow to mostly melt.
3. Add 2 egg yolks and 2 TBS lemon juice.
4. Quickly whisk for 3-6 minutes or until sauce thickens to your liking.
5. If sauce starts to separate, whisk faster for a minute or two longer.
6. If this still doesn't make it come together again, drop an ice cube into the bowl and whisk until it is melted. I don't know why, but ice does the trick!
7. Serve with artichokes, asparagus, eggs benedict, etc.