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Combine water and rice in a medium saucepan; bring to a boil over high heat. Reduce heat to a simmer, cover and cook until the water is absorbed, about 40 minutes.
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Meanwhile, cook beef and lamb in a large skillet over medium-high heat, crumbling with a wooden spoon, until no longer pink, 5 to 6 minutes. Add onions and cook, stirring occasionally, until translucent, 6 to 8 minutes.
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Increase heat to high. Add garlic, turmeric, ginger, coriander and cumin; cook, stirring, until fragrant, about 1 minute. Stir in tomato paste and cook, stirring, for 1 minute. Stir in broth, Worcestershire and salt; bring to a boil. Reduce heat to medium and simmer, stirring occasionally, until thickened, 13 to 15 minutes.
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Serve the balti over the rice, topped with some yogurt and cilantro with naan bread on the side.