Combine berries and sugar, putting alternate layers
of berries and sugar in wide bowl and then using spatula
to gently lift and turn berries. Cover bowl and leave in
refrigerator at least 8 hours. Peel orange,
being careful to remove white membrane;
slice rest of orange. Cook berries, sugar, salt
and orange slices over low heat until sugar dissolves
and berries are hot throughout. and the syrup is as thick as warm honey.
Remove orange slices. Quickly skim off foam;
pour boiling hot preserves into jars and seal. 4 pints.