
In a small bowl or jar with a lid, combine the apple cider vinegar, Dijon mustard, honey, garlic powder, salt, and black pepper. Whisk or shake until the ingredients are well combined. Gradually add the olive oil in a thin stream while whisking continuously until emulsified. Add the red onions and set aside while preparing the rest of the salad.
Place the mixed greens in a large serving bowl, drizzle the dressing with the marinated onions and toss gently to combine.
Scatter the pomegranate arils, pecans, goat cheese and apple slices. Serve immediately.