Foolproof Hollandaise Sauce

From: https://www.americastestkitchen.com/recipes/6407-foolproof-hollandaise-sauce?t=1640123753

Ingredients

12 tablespoons unsalted butter, softened

6 large egg yolks 

½ cup boiling water

2 teaspoons lemon juice

⅛ teaspoon cayenne pepper 

Instructions

Whisk butter and egg yolks together in large heat-resistant bowl set over medium saucepan with 1/2 inch of barely simmering water (don't let bowl touch water) until mixture is smooth and homogeneous.

Slowly add 1/2 cup boiling water and cook, whisking constantly, until thickened and sauce registers 160 to 165 degrees on instant-read thermometer, 7 to 10 minutes. Off heat, stir in lemon juice and cayenne. Season with salt to taste.