Whisk together Greek yogurt, vinegar, garlic, cilantro, and salt. Taste and determine if more salt is needed, or if you think it needs more cilantro or garlic. If it tastes too acidic or tangy, try adding ½ tsp sugar.
Pour the yogurt mixture over the slaw in a large bowl. Stir using a spatula until the slaw mix is well-coated. Refrigerate until serving.