Pomegranate seeds and glaze add bright color and flavor to acorn squash.
Preheat oven to 450 degrees. In a small saucepan, combine the juice, sugar, allspice, peppercorns, bay leaf, and cinnamon. Simmer until reduced to a syrup. Drain through a fine sieve into a small bowl, and discard spices.
Line a baking sheet with parchment paper. Butter parchment. Lay the squash rings on top of parchment; brush tops with melted butter, and season with salt.
Roast the squash until tender when pierced with a paring knife and undersides are well browned, about 30 minutes. Turn squash over, and brush tops with pomegranate glaze. Continue cooking 5 minutes more. Remove from oven; brush squash again with glaze. Transfer to a serving platter; serve immediately, garnished with pomegranate seeds.
Use a citrus reamer, juicer, or press to extract the pomegranate juice.