Combine first 6 ingredients; stir well. Place mixture and roast in a large plastic bag with seal; close bag. Marinate overnight in refrigerator, turning bag occasionally.
Remove meat from marinade, reserving marinade. Place roast on rack in a shallow roasting pan. Insert meat thermometer into meaty part of roast. Bake, uncovered, at 350° for 2 1/2 hours or until thermometer reaches 170°, basting frequently with marinade. Let stand 10 minutes. Slice for sandwiches.
Spread 8 slices of Brown Rice Bread with desired condiments. Top with pork, tomato, and lettuce. Cover with remaining 8 slices.