Gather and weigh your ingredients
Melt the butter in a small sauce pan over medium heat. Remove from the heat and set aside with the lid on
Whisk the yolks, 1 Tablespoon of Lemon Juice, 1 Tablespoon of hot water in a mixing bowl.
Place the mixing bowl over a saucepan of simmering water [called a bain marie] - do not let the bottom of the bowl touch the barely simmering water; Slowly add the melted butter, whisking constantly. When it starts to get thick, add the mustard, Salt & White pepper (pinch) and the fresh herbs. (add any extra lemon juice if needed)
If you need a few minutes to finish plating up your meal, you can set the Hollandaise on the side for a few minutes. When you need to plate up your meal, you may need to add a dash of hot water to the sauce and whisk over the simmering water again just before serving.