Preheat oven to 375 degrees F (190 degrees C). Arrange almonds in a single layer on a baking sheet. Toast in oven for 5 minutes, or until nuts begin to brown.
In a blender or food processor, combine the vinegar, oil, cranberries, mustard, garlic, salt, pepper, and water. Process until smooth.
In a large bowl, toss the almonds, onion, blue cheese, and greens with the vinegar mixture until evenly coated.
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