The Art of French Pastry

remaining 480 grams of
sugar and the lemon juice.
Boil, stirring all the while,
until the jam looks thick
but not too concentrated,
5 to 10 minutes
(depending on the size of
your pan). Skim off any
white foam that rises to
the surface; these are
impurities that you do not
want in your jam as they
might make it spoil or