Hollandaise sauce in a blender

Ingredients:

• 1 large egg yolk
• 1.5 tsp lemon juice
• A pinch of cayenne pepper
• 60 g butter
• 1/2 tsp salt

Preparation:

1. Place the egg yolk, lemon juice, and cayenne pepper in a blender. Blend a couple of times until combined.
2. Place the butter in a small bowl and melt it in the microwave. With the blender running, gradually whisk the melted butter into the egg until you have a smooth sauce. If the sauce is too thick, add a teaspoon of warm water to thin it.
3. Season with salt and serve immediately, or reheat in a small heatproof bowl set over hot (but not boiling) water until the sauce is ready.