How to Make It
Process blueberries in a food processor until smooth, about 2 minutes. Transfer blueberries to a stockpot; stir in sugar, lemon zest, lemon juice, orange zest, orange juice, and grated ginger. Bring mixture to a full rolling boil over medium-high, stirring constantly, and boil 2 minutes. Remove from heat, and stir in liquid pectin. Return to a rolling boil over medium-high; boil, stirring constantly, 1 minute.
Remove from heat, let stand 5 minutes, and skim off any foam. Ladle mixture into hot jars, leaving 1/4-inch headspace. Remove air bubbles. Wipe jar rims. Center lids on jars, apply bands, and adjust to fingertip-tight. Place jars in boiling-water canner. Process as directed for 10 minutes.