With a slotted spoon, lift pears from poaching liquid; reserve liquid. Slice pears lengthwise or cut them into about 1/2-inch chunks.
In a large bowl, combine pears with spinach and macadamia nuts. Coarsely crumble half the cheese over salad.
In a small bowl, whisk together olive oil, rice vinegar, 3 tablespoons reserved pear-poaching liquid (save remaining for another use; see notes), mustard, honey, and thyme. Pour over salad and gently mix to coat, adding salt and pepper to taste. Sprinkle with pomegranate seeds and crumble remaining cheese over salad.
Poached pears: In a 5- to 6-quart pan over medium heat, combine 1 bottle (750 ml.) dry red wine, 3/4 cup sugar, 1 thin strip (3 in. by 1/2 in.) lemon peel (yellow part only), 2 star anise (or 1 teaspoon anise seeds and 1 cinnamon stick, 3 in.), and 1 vanilla bean (6 in.), split lengthwise. Bring to a simmer.
Meanwhile, peel 3 firm-ripe Anjou pears (1 1/2 lb. total), cut in half lengthwise, and core. Place pears in wine mixture. Cover and simmer, turning occasionally, until pears are barely tender when pierced, about 15 minutes. Remove from heat and let pears cool in liquid, turning occasionally, at least 30 minutes, or cover and chill up to 3 days.