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If the apple butter is already made and you'd like to reduce the sweetness, you can add some lemon juice, cranberry juice, or apple cider vinegar, and mix well.
If you're inquiring as to how to make your apple butter less sweet in your original recipe, you can cut down on the amount of sugar, but also reduce the amount of apple cider vinegar, proportionately. Here is a good recipe for homemade apple butter and scroll down to all the useful information below the recipe, in the 'blog':http://simplyrecipes.com/recipes/apple_butter/
Make sure to use the appropriate type of apples, like Granny Smith or Gravenstein and not those varieties that are naturally very sweet, for your apple butter; this should also cut down on the sweetness.
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