The Surprising Ingredient That Makes This Butternut Squash Soup So Good

Sweat the onion, butternut squash, and apple. Warmth the oil in an enormous Dutch broiler over medium-high warmth until sparkling. Add the onion, squash, and apple, and season with 1/2 teaspoon of the salt. Cook, blending frequently, until the onions are clear and the squash and apples start to brown, about 10 minutes.