Sanitize all work areas, cutting boards, equipment and sinks used in the preparation of this recipe.
Combine pineapple and brown sugar into a heavy bottom pot over medium heat.
Cook, while stirring occasionally, until the pineapple caramelizes and the sugar bubbles.
Add Water, cinnamon, cloves and ginger.
Bring to a boil.
Reduce to a simmer, then cover.
Simmer for 20 minutes, while stirring occasionally, mashing and breaking up the pineapple as it cooks.
Remove from the heat.
Add cider vinegar.
Carefully strain shrub through a fine mesh strainer into clean food storage containers.
Cool completely.
Cover, label, date and store for service.
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