This was sooo good! I don't have a double boiler so I had to set a big metal bowl inside a saucepan of boiling water but it still turned out great! I subsituted splenda for the sugar and found that even without adding the second 1/4 cup at the end it was a little too sweet for me. Next time I might try 1/8 cup of sugar/splenda while cooking and then test it at the end before adding any more. Thanks for a great recipe!