Heat oil in a large saucepan over a moderate heat. Saute onion, garlic and ginger for 3 mins or until just soft. Add carrots, potatoes and half the cumin seeds. Cover, reduce heat to low, cook for 7 mins or until just golden.
Add stock, cover and simmer for 15 mins or until vegetables are just tender. Cool slightly then puree until smooth. Season to taste.
Spray bread and sprinkle with remaining cumin seeds. Grill until golden. Cut into triangles.
Top soup with sour cream and coriander leaves. Serve with cumin toast.
Serving size: 4
Recipe courtesy of taste.com.au