Place the egg and water mixture over a double boiler at approximately 180° F and whisk continuously the egg mixture until glossy, thick and smooth. Remove from the heat and slowly whisk in the butter. Do the same with the lemon juice and seasonings. Return to the heat and bring this mixture up to 135° F.
To ensure food safety, eggs should be cooked until both the yolk and the white are firm. Consuming raw or undercooked eggs may increase your risk of foodborne illness, especially for those with certain medical conditions. For recipes that call for eggs that are raw or undercooked when the dish is served, use either pasteurized shell eggs that have been treated to destroy Salmonella, or use pasteurized egg products.