Step 1

Whisk egg yolks and lemon juice in a heatproof bowl.

Step 2

Place bowl over a saucepan of simmering water over low heat. Whisk for 3 minutes or until mixture becomes thick and pale. Add 1 cube butter. Whisk until melted. Repeat with remaining butter (this will take about 10 minutes). Remove from heat. Season with salt and pepper.