Cook 6 medium sweet potatoes in their jackets. Bake in oven or microwave works best. Cool, peel and slice 1/2-3/4 inch thick. Melt 1/3 cup butter and 1 cup brown sugar. Add 2 tablespoons water and mix well. Place potato slices in large, shallow casserole that has been sprayed with Pam. Spoon sugar mixture over potatoes. Bake, covered with foil, 15 minutes in 350 degree oven. Remove foil, baste potatoes with syrup and bake uncovered until bubbly all over and potatoes are glazed.