Heat crab legs.
Hollandaise: In a double boiler, whisk eggs yolks, lemon juice and salt and cook until mixture is custardy and fluffy.
Slowly add melted butter, whisking the whole time.
Add 1 tablespoon prepared Pesto that has been slightly heated in a microwave or a saute pan.
Pesto: Mix ingredients in food processor or blender, or finely chop by hand and stir together.
Makes 1 1/4 - 1 1/2 cups.