Season beef with salt, pepper, cayenne, and paprika. Let marinate for 20 minutes.
Sear beef in oil until browned; set aside.
Sauté onions, celery, peppers, and garlic until translucent.
Return beef to pot with accumulated juices.
Add soy sauce, Worcestershire, granulated garlic, water, and bouillon paste. Simmer until beef is tender.
Taste and adjust seasoning if needed.
Cook spaghetti until tender, then divide into soup bowls.
Ladle hot soup over noodles and garnish with egg, hot sauce, and green onions.