Heat a large skillet over medium-high heat. Add ground beef, add onions, garlic, and mushrooms; saute until onion is golden brown.Season with salt and black pepper.
Stir 2 cups hot water, bouillon cubes, and tomato paste into meat mixture. Stir together 1 1/2 cups cold water and flour; stir into pan.Reduce heat to low, and simmer for 1 hour.
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