Spiced Cauliflower Soup

Name: Spiced Cauliflower Soup
Cuisine: Asian, Indian
Ingredients: 2 tablespoons olive or peanut oil; 1/2 teaspoon whole cumin seeds; 1/4 teaspoon whole fennel seeds; 1 medium onion, peeled and chopped; 1 medium potato (about 6 ounces), peeled and chopped; 2 teaspoons peeled and chopped fresh ginger; 2 cloves garlic, peeled and chopped; 1 fresh hot green chili, chopped (more or less to taste); 2 teaspoons ground coriander; 1 teaspoon ground cumin; 1/4 teaspoon ground turmeric; 1/4 teaspoon red chili powder or cayenne (to taste); About 3 1/2 cups cauliflower florets (from about 1/2 a large 2.75-pound head); 2 medium tomatoes, peeled and chopped or 1 1/2 cups canned chopped tomatoes; 1 1/2 teaspoons salt, or to taste (we wanted more); A couple spoonfuls heavy cream or dollops of yogurt; 1/2 cup cooked basmati or other long-grain white rice; Handful of fresh cilantro, chopped; Freshly ground black pepper; Lime wedges; Toasted pita or naan wedges