Melt the butter slowly in a small pot. Try not to let it boil—you want the moisture in the butter to remain there and not steam away.

Add the egg yolks, lemon juice, salt into your blender. Blend the egg yolk mixture at a medium to medium-high speed until it lightens in color, about 30 seconds.

Once the yolks have lightened in color, turn the blender down to its lowest setting, and drizzle in the hot melted butter slowly, while the blender is going.

Continue to blend for another couple seconds after the butter is all incorporated.

Turn off the blender and taste the sauce. Taste for seasoning and add more lemon juice or salt to taste.