Potato Soup
["1/2 c. chopped onion", "2 tsp. butter", "4 medium potatoes, diced", "1/4 c. flour", "1 1/2 c. milk"]
["Cook onion, potatoes and butter in water to cover, until tender.", "Blend flour with milk until smooth.", "Add to potato mixture.", "Cook until boiling, about 1 minute.", "Season to taste with salt and pepper."]
["onion", "butter", "potatoes", "flour", "milk"]