I gave this recipe 4 stars for the taste and texture of the final result which were both excellent - nicely tart with just the right hint of sweetness and a very light ice-cream like texture, however the recipe itself it poorly written and very vague.
"Cook over low heat, stirring constantly." should be appended with "until it thickens."
"Fold into pudding mixture." would be clearer as "Fold into lemon mixture." Although I found it far easier to fold about 3/4 of a cup of the egg whites into the lemon mixture then fold that into the remaining eggs due to the small volume of the lemon mixture.
"add filling or milk." makes absolutely no sense even in context with "Fold in the whipped cream; add filling or milk." I can only assume the writer meant "Fold the whipped cream or milk into the filling."