Bring the vinegar, 1/2 cup water, honey, fish sauce and chili garlic sauce to a simmer in a small saucepan. Cook until reduced by half and thickened. Set aside to cool
Shred the Brussels sprouts using the slicer attachment of a food processor or with a knife. Transfer to a large bowl and add the carrot, bell pepper, cilantro, peanuts and scallions. Toss to combine. Pour the dressing over the slaw and mix until well coated.
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