Arrange a rack in the middle of the oven and heat the oven to 375ºF. Meanwhile, melt the remaining 1 tablespoon unsalted butter and place in a small bowl. Add 1 tablespoon of the all-purpose flour and mix to form a paste. Brush the paste on the inside of a 12-cup bundt cake pan, making sure to thoroughly coat the tube and all the crevices. Trim and dice 1 pound strawberries.