Pour boiling water over the blossoms in a heat-proof bowl. Cover andrefrigerate for 12–24 hours.
Strain the liquid through a fine sieve and discard the petals.
Stir in the lemon juice, and watch the liquid shift from grayish-purpleto a bright pink.
Pour into a large pot, whisk in the pectin, and bring to a rolling boil.
Add the sugar all at once. Return to a hard boil and cook for exactly 1minute, stirring constantly.
Remove from heat, skim off any foam, and pour into sterilized jars.Process in a water bath for 10 minutes.