In a large pot, heat the olive oil over medium heat. Add the onion, carrots, celery, and garlic and sauté until the vegetables are softened, about 5 minutes.
Add the beef and cook, stirring occasionally, until the beef is browned, about 7 minutes.
Stir in the tomato paste, Worcestershire sauce, and thyme and cook for 2 minutes.
Add the beef broth and bring to a boil. Reduce the heat to low and simmer for 15 minutes.
Add the peas and simmer for 5 minutes.
Taste and season with salt and pepper, if desired.
Serve the Scotch Broth hot.
Interesting Facts
Scotch Broth is a traditional Scottish soup.
The soup is often served with crusty bread or oatcakes.
The soup is traditionally made with beef, but lamb or mutton can also be used.
Scotch broth is often served at Burns Night celebrations.