Heat oil in large pan. Saute onion, garlic, carrot, celery & lentils until vegetables are tender. Keep stirring so lentils do not burn. Add water & bouillon and bring to boil. Add cumin & Simmer for 15 minutes until lentils are tender.Add salt & pepper to taste. Cook pasta according to package directions while soup is simmering.
Cool slightly then use hand blender to blend until smooth. Add the pasta and yogurt and heat 2-3 minutes until hot. DO NOT BOIL AFTER YOGURT IS ADDED.