How to Make It
Place bacon and onion in a 6- to 8-qt. slow cooker. Stir together salt and pepper; sprinkle over all sides of brisket. Place brisket in slow cooker.
Process broth and next 7 ingredients in a blender for 30 seconds or until smooth; pour mixture over brisket. Cover and cook on LOW 7 hours or until brisket is fork-tender. Transfer brisket to a 9- x 13-inch baking dish; cover with aluminum foil to keep warm.
Pour sauce through a fine wire-mesh strainer into a medium saucepan, and cook over medium-high heat, stirring occasionally, 15 to 20 minutes or until reduced to 1/3 cup. Stir in vinegar.
Coarsely chop brisket; spoon over warm tortillas. Drizzle with sauce, and top with Crunchy Summer Salsa.