Creating this stew is simple, yet it requires patience to allow the flavors to meld beautifully. Follow these steps for a delightful result:

1. Prepare the Beef:
   • Season the beef cubes with salt and black pepper.
   • Heat 2 tablespoons of olive oil in a large skillet over medium-high heat.
   • Brown the beef cubes in batches, ensuring each side is well-seared. Transfer to a slow cooker.
2. Cook the Onions:
   • In the same skillet, add the remaining tablespoon of olive oil.
   • Add the sliced onions and cook over medium heat, stirring frequently until they become soft and golden brown. This should take around 15 minutes.
3. Add Garlic and Flour:
   • Stir in the minced garlic and cook for an additional 2 minutes.
   • Sprinkle the flour over the onions and garlic, and stir well to coat.
4. Deglaze the Skillet:
   • Pour in the red wine, if using, and scrape up any brown bits from the bottom of the skillet.
   • Allow the wine to simmer for about 5 minutes, reducing slightly.
5. Combine Ingredients:
   • Transfer the onion mixture to the slow cooker with the beef.
   • Add the beef broth, tomato paste, Worcestershire sauce, bay leaves, and thyme.
   • Stir all ingredients to combine.
6. Slow Cook:
   • Cover the slow cooker and cook on low heat for 7-8 hours or until the beef is tender and the flavors have melded together.
7. Final Seasoning:
   • Taste the stew and adjust seasoning with additional salt and pepper, if necessary.
   • Remove bay leaves before serving.
8. Serve:
   • Ladle the stew into bowls, garnish with chopped parsley, and enjoy!