Fry onion in ghee till brown at the edges, add flour fry till brown.
Add rest of vegetables, cook in water till tender, but not over-done.
Drain vegetables and grind them. Repeat for rest of the vegetables.
Mix the ground vegetables with stock, add milk and water to obtain desired consistency. Bring to a boil. Add salt and pepper to taste. Serve sprinkled with grated cheese if desired.