Pour the apple cider into a small saucepan over medium-high heat. Bring to a boil, then reduce the heat to maintain a steady simmer.
Let the cider simmer for 15-20 minutes, or until it has reduced to about ¼ cup (60 ml).
Remove the saucepan from the heat and let the cider reduction cool to room temperature.
Once cooled, transfer the reduction to a jar or small bowl. Add the olive oil, apple cider vinegar, poppy seeds, Dijon mustard, minced garlic, salt, and pepper.
Seal the jar and shake vigorously until the dressing is well combined, or whisk everything together in the bowl.
In a large salad bowl, combine the arugula, sliced pear, pomegranate arils, and pickled red onions.
Drizzle about half of the dressing over the salad and toss gently to coat.
Add the crumbled goat cheese and chopped candied pecans to the bowl.
Toss once more, add more dressing if desired, and serve immediately.