Preheat oven to 400ºF. Line a baking tray with parchment paper. Place cauliflower, garlic, onions, and thyme on the baking tray and drizzle with olive oil. Gently toss together and sprinkle with 1 teaspoon of the salt. Roast for about 25 minutes or until all the vegetables are soft and medium brown in color.
Heat the broth while the vegetables are roasting. Transfer vegetables to a blender. Add the warm vegetable broth, cashews, nutritional yeast, lemon juice, remaining 1 teaspoon of salt, and black pepper. Remove the plastic knob from the blender and partially cover the hole with a dish towel to allow steam to escape. Purée the soup to the desired consistency (leaving a little texture makes for a nice mouth-feel). To serve, ladle soup into bowls and garnish.
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