Heat oil in a large pot over medium heat.
Add cumin and mustard seeds and cook for 1 minute, until fragrant.
Add onion and cook until softened, about 5 minutes.
Add garlic and cook for 1 minute more.
Add carrots, turmeric, cumin, salt, and pepper. Cook for 5 minutes, stirring occasionally.
Pour in vegetable broth and bring to a boil. Reduce heat and simmer for 10 minutes, or until carrots are tender.
Stir in cooked wild rice and cider vinegar.
Serve hot, garnished with chopped hazelnuts, cilantro, and orange zest, if desired.