Heat 1 Tbsp butter in a kettle over medium heat. Add brisket and cook, turning, until evenly browned. Sprinkle with 1 tsp salt and 1/2 tsp pepper. Add 3/4 cup beef broth, 1 Tbsp brown sugar, and 1 1/2 tsp cider vinegar; bring to a boil. Reduce the heat to low, cover, and simmer for 2 1/2 to 3 hours, or until the brisket is tender.
Meanwhile, heat 1 Tbsp butter over low heat until melted. Add sliced onions and cook for 20 minutes, or until soft, stirring occasionally. Stir dried mixed fruit, 1 cup beef broth, 1 Tbsp brown sugar, 1 1/2 tsp cider vinegar, and ginger. Cover tightly and simmer over very low heat for 20 minutes, or until the fruit is soft, stirring occasionally.
Remove the brisket from the pan and keep warm; skim the surface and stir cornstarch into the pan juices. Cook, uncovered, over medium-high heat about 5 minutes, or until slightly thickened, stirring. Season with 1/4 tsp salt and 1/8 tsp pepper.
Serve the brisket with the gravy and fruit sauce.
Servings: 8