Sig's. Leek and Blue Cheese soup

Slice leeks very thinly,heat oil and butter, add leeks.Cook until soft but not browned about 10-15 minutes.Grate or crumble 125 grams of tbe cheese and melt into the cooked leeks now add the flour and stir well in for about 2 minutes,add pepper and mustard to taste.Stirring for about 3 minutes.

Slowly add the stock stirring all the time blending all ingredients, bring soup to boil, reduce heat, cover and gently cook for about 15 minutes.Check for seasoning. Serve the soup garnished with the last 50 grams of crumbled cheese and slices of springonions.