In a large stock pot put the butter and oil in pot, add the chopped onions, celery and sauté on medium heat. Saute until onions are translucent and soft, cook for about 5 to 7 minutes, making sure you do not brown or burn them. After the onions and celery are cooked add the 2 tablespoons of flour to make a roux whisking constantly cooking for 1 to 2 minutes without burning the flour on a medium to low heat, this will thicken your sauce. Add the Cream of Chicken, and Cream of Celery soup. Fill the cans of soup up with milk and pour into stock pot. Whisk until all blended and bubbly, cooking on medium heat. Add the parsley, peas, 1 cup of the Sharp Shredded Cheese, tuna, salt and Pepper stirring and whisking until well blended. After this mixture has reach a bubbly state turn down to a very low heat.