1. 1. Heat oven to 450 degrees. Cut acorn squash in half lengthwise, scoop out seeds, and place, cut side down, on a baking sheet coated with olive-oil cooking spray. Roast until tender, about 45 minutes.
2. 2. Combine chicken stock, apple cider, 1 teaspoon horseradish, salt, and pepper in a medium saucepan, and bring to a simmer. Scoop squash flesh out of skins, and place in the bowl of a food processor. Add 1 cup stock mixture, and puree until smooth. Stir squash mixture into pan with remaining stock, and keep soup warm.
3. 3. Peel and core apples, and cut into 1/4-inch dice. Transfer to a small bowl, add lemon juice and remaining 2 teaspoons horseradish, and toss to combine. Heat a medium sautepan coated with olive-oil cooking spray over medium-high heat. Add apple mixture, and saute until golden brown. Serve soup garnished with sauteed apple mixture and chopped parsley.

For Roasted-Beet Soup:

1. 1. Individually wrap 2 1/2 to 3 pounds beets in aluminum foil, leaving the skin on. Roast them in 450-degree oven until fork-tender, about 1 hour. When cool enough to handle, remove the skins by wiping the beets with a paper towel. Proceed with the acorn-squash soup recipe from step 2.

For Roasted-Carrot Soup:

1. 1. Wrap about 3 pounds peeled and trimmed carrots in an aluminum foil packet. Roast them in 450-degree oven until fork-tender, about 45 minutes. Proceed with the acorn-squash soup recipe from step 2.