Blackberry Jam

Blackberry jam and preserves are two of the South’s most ubiquitous condiments, each used not only to spread on breakfast breads but also to make all sorts of pastry fillings, glazes, icings, and sauces. Since the natural pectin in blackberries is what allows the jam to jell, do not discard any berries just because they’re underripe; these contain the most pectin. You can try to check the jam for consistency the old-fashioned way, by testing a teaspoon of it on an ice-cold plate to see if i