I haven't made these lemon ones yet, but I scaled down a larger recipe from some cookbook to resemble the pecan tassie proportions, hoping to have enough lemon filling for a batch of tartlets. So it may or may not be enough, thought I'd let ya know.
LEMON TASSIE FILLING: In a small saucepan over low heat, cook the 1 st three until dissolved. Beat the eggs with a mixer and add the hot mix very slowly, mixing constantly. Then return mix to the saucepan and cook for about 3 minutes until it's of pudding consistency. Stir in lemon peel. Let cool to room temp. Fill each tartlet with about 2 tsps of the lemon mix. Bake at 350 F for 20-25 mins. , or until golden.
The back of the tart tamper package also suggested some other fillings, like cherry or blueberry pie filling, or vanilla pudding topped afterwards with a strawberry or a few blueberries (glaze with some heated currant jelly).