Curried Sweet Potato and Millet Soup

Ingredients

• 1 tbsp / 15 ml vegetable oil
• 2 onions, finely chopped
• 2 carrots, peeled and diced
• 2 stalks celery, diced
• 2 cloves garlic, minced
• 2 tsp / 10 ml minced ginger root
• 2 tsp / 10 ml curry powder
• 1 tsp / 5 ml freshly grated orange zest
• 2 cups / 500 ml sweet potato puree (see tips, below)
• 6 cups / 1.5 L low-sodium vegetable or chicken stock
• 3/4 cup / 175 ml millet, toasted (see tips, below)
• 1 cup / 250 ml freshly squeezed orange juice
• 1/4 cup / 50 ml pure maple syrup
• salt and freshly ground black pepper
• toasted walnuts or sliced almonds
• plain yogurt, optional