Preheat oven to 350 degrees F.

Slice off the base of each pear so it will stand upright. Use an apple corer (or small spoon) to remove cores, if desired, working from the base up. Peel if desired, but leave the stems on. Place the pears on a baking sheet and brush with agave syrup. Roast until browned and tender, 30 to 45 minutes, depending on the size and ripeness of the pears.

Whisk pomegranate juice, vinegar, oil, brown sugar, orange zest, shallot, garlic, salt, pepper, chipotle and cloves in a large bowl or puree in a blender.

Toss arugula and lettuce with the dressing in a large bowl and divide among 6 chilled plates. Set a pear on each plate and scatter some pomegranate seeds on the greens (if using).

Notes: Agave syrup or nectar is the naturally sweet juice extracted from the agave plant. It has a lower glycemic index and is lower in calories than table sugar, but is even sweeter. Use it in moderation when substituting for table sugar. Look for it near other sweeteners in natural-foods stores.

Chipotle peppers are dried, smoked jalapeno peppers. Ground chipotle can be found in the specialty-spice section of most supermarkets or online at penzeys.com.

Tip: To seed a pomegranate, fill a large bowl with water. Hold the pomegranate in the water and slice off the crown. Lightly score the fruit into quarters, from crown to stem end. Keeping the fruit under water, break it apart, gently separating the plump seeds from the outer skin and white pith. The seeds will drop to the bottom of the bowl and the pith will float to the surface. Discard the pith. Pour the seeds into a colander. Rinse and pat dry. The seeds can be frozen for up to 3 months.

MAKE AHEAD TIP: Cover and refrigerate the dressing (Step 3) for up to 3 days.