Roasted Cauliflower Soup

Step 1
Soak cauliflower florets in a large bowl of lightly salted water for 20 minutes. Drain well, then pat dry.

Step 2
Set an oven rack about 6 inches from the heat source and preheat the oven's broiler. Line a baking sheet with heavy-duty aluminum foil.

Step 3
Arrange cauliflower in a single layer on the prepared baking sheet; spray evenly with cooking spray.

Step 4
Broil in the preheated oven until browned, 20 to 30 minutes.

Step 5
Heat oil in a large soup pot over medium heat. Add onion and saut? until translucent, about 5 minutes. Stir in roasted cauliflower and garlic. Pour in water, season with salt and pepper, and simmer until all vegetables are tender, about 30 minutes. Pur?e soup with an immersion blender until smooth.