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Heat 1 ½ tablespoons olive oil in a large pot over medium-high heat. Season beef with salt and pepper. Cook meat, stirring often, until all sides are browned. Remove to a plate.
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Add remaining 1 ½ tablespoons olive oil and reduce heat to medium. Add onion, carrot, and celery and season with a little bit of salt and pepper. Cook, stirring often, until vegetables are beginning to soften, about 8 minutes. Add garlic and cook until fragrant, 1-2 more minutes.
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Add oregano and paprika and mix well. Add beef back to pot. Add bay leaf. Pour in beef broth and tomatoes. Scrape any browned bits off the bottom of the pot. Bring to a simmer, then turn heat down to medium-low. Simmer for 1 hour, uncovered, stirring occasionally.
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Add quinoa and potatoes and stir to incorporate. Simmer for about 20 more minutes, until quinoa is cooked and potatoes are tender. Season to taste.
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Remove bay leaf. Garnish with chopped parsley just before serving.