Yakamein

Ingredient:

• 4 pounds beef bones, roasted
• 2 heads garlic, cut in half
• 1 medium (6-ounce) onion, sliced
• 2 celery stalks, chopped
• 1/2 bell pepper, chopped
• 1/2 cup oyster sauce
• 1/2 cup soy sauce
• 8 ounces sliced mushrooms
• 3 bay leaves
• 2 tablespoons hot sauce
• 3 tablespoons Worcestershire sauce
• 2 medium (3-ounce) tomatoes, chopped
• 9 cups water
• 1 (2-pound) boneless chuck roast, trimmed
• 2 teaspoons kosher salt, plus more to taste
• 2 teaspoons black pepper, plus more to taste
• 1 pound spaghetti, cooked according to package directions
• 1/2 bunch scallions, trimmed and sliced (about 1/2 cup)
• 4 hard-cooked eggs, halved