Prepare grill for indirect medium heat (325°F). Preheat grill by turning all burners to high.
For the Brisket, mix Spice Blend and sea salt. Place brisket, fat side up, in 13x9-inch disposable foil pan. Rub all over with seasoning mixture. Pour stock around brisket. Cover with foil.
Turn burner on 1 side to medium-high. Turn off burner(s) on other side. Place pan on unlit side of grill. Close grill. Grill 3 hours or until brisket is tender. Remove brisket from grill. Let stand 10 minutes.
Meanwhile, for the Fennel Slaw, mix vinegar, orange juice, granulated sugar, oil and sea salt in large bowl until well blended. Add carrots, fennel and red onion; toss to coat well. Cover. Refrigerate until ready to serve.
For the BBQ Sauce, mix all ingredients in medium saucepan on high heat. Bring to boil. Reduce heat to medium; cook 20 minutes or until slightly thickened and sauce is reduced to about 2 cups, stirring occasionally.
To serve, slice brisket. Serve in rolls with BBQ Sauce and Fennel Slaw.