Ingredients

• 2 tablespoons vegetable oil
• 2 leeks, chopped
• 1 1/2 cups celery, chopped
• 1 tablespoon garlic, crushed
• 1 tablespoon fresh thyme or 1 teaspoon dried thyme
• 3 lbs cauliflower, small florets
• 4 cups chicken broth
• 1 cup whipping cream
• 1 1/2 cups gruyere cheese, finely grated
• 1 pinch cayenne
• chives, finely chopped
• 1 1/2 cups onions, chopped