Indian Spiced Carrot Soup with Ginger Recipe

Ingredients

• 1 teaspoon coriander seeds
• 1/2 teaspoon yellow mustard seeds
• 3 tablespoons peanut oil
• 1/2 teaspoon curry powder (preferably Madras)
• 1 tablespoon minced peeled fresh ginger
• 2 cups chopped onions
• 1 1/2 pounds carrots, peeled, thinly sliced into rounds (about 4 cups)
• 1 1/2 teaspoons finely grated lime peel
• 5 cups (or more) low-salt chicken broth or vegetable broth
• 2 teaspoons fresh lime juice
• Plain yogurt (for garnish)