Vegetarian Pho Broth

Name: Vegetarian Pho Broth
Ingredients: 1 large or 2 small onions, peeled and quartered lengthwise; 2 ounces fresh ginger (a 3- to 4-inch piece, depending on thickness); 2 tablespoons peanut oil; 2 medium leeks, white and green parts, coarsely chopped into 1-inch pieces; 2 large carrots, coarsely chopped into 1-inch pieces; 1 medium daikon radish (12 ounces), peeled and coarsely chopped into 1-inch pieces; 10 garlic cloves, peeled; 1 stalk fresh lemongrass, smashed and coarsely chopped; 3 whole star anise; 3 whole cloves; 2 cinnamon sticks; 1/2 teaspoon fennel seeds; 5 dried shiitake mushrooms; 1 handful fresh cilantro stems