This Roasted Cauliflower Soup recipe is supremely comforting and surprisingly complex. The roasting process caramelizes the creamy white vegetable's natural sugars, resulting in intense, luxurious flavor.
Preheat oven to 400 degrees F. In a large roasting pan combine cauliflower, onion, and garlic. Drizzle with oil; toss gently to coat. Spread vegetables in an even layer. Roast, uncovered, for 30 minutes, stirring once.
In a 4-quart Dutch oven combine roasted vegetables, broth, the water, bay leaf, and thyme. Bring to boiling; reduce heat. Simmer, covered, for 20 minutes; cool slightly. Remove and discard bay leaf.
Transfer vegetable mixture in batches to a food processor or blender. Cover and process or blend until smooth. Return pureed mixture to saucepan. Stir in half-and-half, salt, and pepper. Heat through (do not boil).