Potato Cheese Soup

1 c chopped onion
1 c chopped celery
2 c chopped potato
3/4 c flour
3/4 c butter
1 qt half and half
1 1/2 tsp salt and pepper
1/2 tsp sugar
cheddar cheese

cover vegetables with water. Bring to a boil, simmer until potatoes are tender, not mushy. While that is cooking melt butter. Add flour and blend. Cook until thick. Slowly add half and half and cook until smooth and thickened. Add salt. pepper, and sugar. Stir in vegetables and 1 cup liquid from vegetables. Heat through and remove from heat. Add about 1 cup of cheese to taste.