1. Heat oil in Dutch oven or large, heavy saucepan over medium heat. Add onions, and saute for 15 minutes, or until golden brown. Add garlic during last few minutes of browning onions, and continue cooking. Sprinkle with turmeric, mink flakes, salt and pepper, and fry for 20 seconds.
2. Add mung beans and water, increase heat to medium-high and bring to a boil. Reduce heat to medium, and cook, partially covered, for 15 minutes, stirring occasionally. Add walnuts and bulgar, and return to a boil. Reduce heat to medium-low, and cook, covered, for 20 minutes, or until beans are tender.
3. Add herbs and spinach, and continue to cook, covered, for another 15 minutes. Add more water if soup is too thick.
4. Reduce heat to very low, and add yogurt or whey, stirring constantly for 5 minutes to prevent curdling. Add lime juice. Adjust seasonings to taste, adding more salt or lime juice if needed. Keep warm over very low heat. When ready to serve, pour into tureen, and garnish soup with herbs.