Add 1 cup of clean rowan berries to a quart-sized mason jar. Cover with 1 cup sugar and 1 cup apple cider vinegar.
Shake to incorporate, then date and label the jar. Allow the rowan berries to macerate for one week.
Shake the jar daily for one week, then strain into a clean mason jar.
Notes
Dehydrated orange slices, cinnamon, cardamom pods, ginger, and cloves can be added to the jar to enhance the flavor of the shrub.
Rowanberries pair well with apples, oranges, pears, strawberries, nutmeg, ginger, cinnamon, cloves, honey, basil, and pepperment.
When foraging for rowanberries, a pair of pruning shears and a canvas bag come in very handy for clipping the clusters from the tree and transporting them back home.
Clean the rowanberries to remove insects and debris, then freeze them in freezer bags until you are ready to make something wonderful with them.