BLUEBERRY SEVILLE JAM WITH COFFEE VINEGAR
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Experiment No. 9: Acid League x Preservation Society
Preservation Society had two hit flavors containing coffee—a blueberry jam and a Seville marmalade—, this kind of combines the two. I find cooked blueberries can be insipid. Coffee brings backbone that lends interest but is subtle enough that you're not even sure what it is. The high pectin orange also bolsters the low pectin blueberry so you get a nice set without using commercial pectin.
Complex, Zesty, Bright
Blueberry, Bitter Orange, Coffee
Buttered Toast, Productive Mornings
Blueberries, Sugar, Seville Oranges, Lemon Juice, Coffee Vinegar