Egg Custard - cooking recipe

Ingredients

3 eggs, separated
1 heaped c. sugar
3/4 large can evaporated milk
1 scant Tbsp. flour
1/2 stick butter
vanilla to taste

Preparation

The egg custard
recipe
was
told to me by a Great Aunt before she died.
This
is
not
a standard recipe and may take some \"trial
and
error\" to perfect this one.
The instructions are written as she told them to me.
She used this basic recipe for chocolate,
coconut
and
other
flavors
as
well.
But my family enjoys it just as a vanilla cream egg custard.