Roasted Sweet Potato and Apple Soup

Why I Love This Recipe
I love hearty soups, and this is one of the best I've had. The celery and apples give it a nice crunch!
Ingredients You'll Need
3 pounds sweet potatoes
1 tbs olive oil
1 onion
1 celery stalk
1 apple (I prefer Braeburn or Honey Crisp)
sea salt and ground black pepper
Directions
1) Heat oven to 400 F
2) Prick the potatoes with a fork, place on a baking sheet, and roast until tender, 40-45 minutes
3) Meanwhile, heat the oil in a large saucepan over medium-high heat. Add the onion, celery, and apple and cook, stirring occasionally, until soft, 10-12 minutes
4) Halve the potatoes, scoop out the flesh, and add to the saucepan. Add 6 cups of water, 2 teaspoons of salt, and 1/2 teaspoon of pepper. Cook until heated through, 8-10 minutes.
5) Puree the soup in the saucepan using a handheld immersion blender (or, working in batches, a standard blender) Add water, if necessary, to reach the desired consistency.