In a medium bowl, combine 3/4 cup plain Greek yogurt, 1 Tablespoon Dijon mustard, 1 Tablespoon apple cider vinegar, 2 Tablespoons pineapple juice, 1/2 teaspoon Kosher salt, and 1/4 teaspoon black pepper. Stir the mixture until smooth and well combined.
In a large bowl, toss together one 10-15 oz. bag coleslaw mix or about 4-5 cups shredded cabbage, 1 cup pineapple tidbits, and 1/2 cup macadamia nuts, coarsely chopped until evenly distributed.
Pour the dressing over the slaw mixture and stir gently to ensure everything is coated evenly with the dressing.
Serve immediately for the freshest taste, or store the coleslaw in the refrigerator until you are ready to serve. It can be kept for a couple of days, but the texture may soften over time.