Prepare the Thickener: In a small bowl, mix the all-purpose flour with cold water until smooth. Set aside.
Brown the Beef: In a large nonstick pot over medium-high heat, melt 1 tablespoon of unsalted butter. Add the beef and cook until browned on all sides. Once done, transfer the beef to a bowl and set aside.
Saute the Aromatics: Using the same pot (with any remaining beef fat or if the pot is dry, add the remaining tablespoon of butter.), sauté the diced yellow bell pepper, onion, and minced garlic. Cook for 5–10 minutes, or until the vegetables soften and start to brown at the edges.
Build the Stew Base: Stir in the tomato paste and pour in the beef stock. Mix well, scraping up any bits from the bottom of the pan. Bring the mixture to a gentle boil.
Add the Veggies and Beef: Add the drained carrots and peas, then return the browned beef to the pot. Stir to combine everything evenly.
Simmer Until Tender: Cover and reduce the heat. Let it simmer for about 20 minutes, or until the beef becomes tender and the flavors blend together. Stir occasionally.
Serve and Enjoy: Serve hot with steamed white rice or pair it with your favorite side dish. Enjoy the warmth in every spoonful!