Curried Cauliflower Soup

INGREDIENTS

• ½ teaspoons dried coriander
• 1 cup yogurt or labane (optional; adjust to suit tastes)
• 1 teaspoon cumin
• 2 cups chicken or vegetable broth
• 2 tablespoons vegetable oil
• ½ teaspoons turmeric
• 4 cups water
• ½ teaspoons hot paprika or chili powder
• 1 head cauliflower (about 2 1/4 pounds), cut into florets (about 6 cups)
• 3 onions, sliced 1 inch thick
• 1 tablespoon chopped butter