Soak cauli bites in a large bowl of salted water for 20 minutes. Drain well and pat dry.
Set an oven rack about 6 inches from the heat source and preheat the broiler's flames. Line a baking sheet with heavy-duty foil.
Arrange cauli bites on the prepared baking sheet; spray evenly with cooking spray.
Broil until golden, 20 to 30 minutes.
In a large soup pot over medium heat, warm olive oil. Add diced onion and sauté until softened, about 5 minutes. Introduce roasted cauli bites and minced garlic.
Pour in water; season with salt and pepper. Simmer until the veggies tenderize, around 30 minutes.
Purée the soup using an immersion blender until silky smooth.
Discover amazing recipes from around the world