Beef

Combine beef, pepper, soy sauce, white wine vinegar, bay leaves, lemon, and tomato sauce; mix and marinate at least 30 minutes
Place marinated beef and remaining marinade into a pot, add water, and bring to a boil
Add beef stock concentrate, stir, cover, and simmer on low for 40 minutes
Turn the beef over, add tomato puree, and continue cooking until tender; set aside
Heat olive oil in a pan and fry potatoes and carrots until browned on both sides; remove and set aside
Reserve 3 tablespoons of pan oil and sauté onion and garlic until the onion softens
Pour in the beef stew sauce, bring to a boil, add the beef, and cook for 2 minutes
Add butter, let it melt, and cook until the sauce reduces by half