Place the cranberries on a parchment-lined baking sheet and bake them for about 20 minutes at 350 degrees F, until they look something like this. If you listen carefully you can hear them popping in the oven. Transfer the roasted cranberries to a quart-sized mason jar.
Add the 1 cup of sugar and cover and seal the mason jar. Shake the hell out of it so that all of the cranberries are covered with sugar. Let stand in a dark cool place for 5 hours; the sugar and cranberries will form a syrup.
Add 1 cup of vinegar to the cranberries. I used apple cider vinegar but you can also try others, such as champagne or red wine. Cover and shake the mixture, trying to dissolve as much of the remaining sugar as possible.
Add in the fresh sage leaves and stir, so they are soaking in the vinegar. Let the cranberry mixture stand for 24 hours in a dark cool place, shaking regularly.
Strain the mixture through a sieve and store in a clean mason jar.
Shrubs can be served in a variety ways. You can drink them straight or even use them in cocktails. I served this shrub with some club soda. Using a single old fashioned glass filled with ice cubes, add 2 ounces of cranberry and sage shrub syrup and top off with club soda. Garnish with fresh cranberries.