1. Microwave 8 cups water and 1 Tbsp. kosher salt at HIGH in a large microwave-safe glass bowl 2 minutes. Submerge noodles in water; let stand 20 minutes or until tender. Drain.
2. Meanwhile, toss together pineapple and next 4 ingredients; add table salt and black pepper to taste.
3. Whisk together hoisin sauce, next 4 ingredients, and 2 Tbsp. water. Combine drained noodles and 2 Tbsp. hoisin sauce mixture in a medium bowl, tossing to coat.
4. Divide lettuce among 4 bowls. Top with noodles, pineapple mixture, brisket, and peppers. Drizzle with desired amount of remaining hoisin mixture. Sprinkle with herbs, and serve immediately.