Preheat oven to 350°F. Rub 3 tablespoons barbecue seasoning on both sides of brisket. Place brisket in shallow baking pan. Add 1 cup water to pan. Cover pan tightly with foil. Bake 3 to 4 hours until brisket is very tender. Remove from oven and let meat rest 10 minutes. Slice brisket into thin slices approximately 1/4-inch thick. Simmer briefly in Barbecue Sauce, if desired.
Combine all Barbecue Sauce ingredients in a medium saucepan over medium heat. Stir to combine. Simmer 30 minutes or until thickened.
To prepare Jicama Slaw, combine all vegetables in large bowl. Combine mayonnaise, sugar and spices in small bowl. Add dressing to slaw and stir until combined. Chill until ready to serve.
Assemble the sandwich on bun with 4 ounce serving of brisket with Barbecue Sauce topped with 1/2 cup Jicama Slaw. If desired, serve Barbecue Bean Medley on the side.