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Peel and finely chop the clove of garlic and dice the onion. Divide the sirloin or rump steak into bite-sized chunks.
It's important to buy high-quality beef for this recipe, otherwise, it will take much longer for the meat to become tender.
Heat 1 tablespoon of olive oil in the medium-sized pan on medium-high heat. Cook the sirloin steak chunks until brown, this usually takes up to 5 minutes. Stir using a wooden spoon to prevent the meat from sticking to the pan.
Add chopped onion along with garlic and a tablespoon of dried oregano. Keep cooking until the onion becomes golden brown. Pour a glass of red wine (any kind will do) and 1 can of tomatoes into the pan.
Let it simmer for at least 10 minutes, or until thickened and rich. Turn down the heat to low and let it simmer for about 5 minutes. Serve the beef sirloin in red wine sauce casserole with potatoes, pasta or fries. Enjoy!