* Cooking time for the eggs is a matter of personal preference. The cooking time given here will result in runny yolks. Cook longer if you prefer firmer yolks.[br][br][br]Cook’s Note: If you are making the Béarnaise Sauce in advance, you can reheat it over a double boiler, or on low in your microwave. When using a double boiler, be very careful never to let the water boil, or to let the hot water touch the bottom of the top section, as this will cause the sauce to curdle.[br][br][br]Cook’s Note: If you are making the Béarnaise Sauce in advance, you can reheat it over a double boiler, or on low in your microwave. When using a double boiler, be very careful never to let the water boil, or to let the hot water touch the bottom of the top section, as this will cause the sauce to curdle.