1. In a 4- to 6-quart slow cooker, whisk together the tomato paste, garlic, curry powder, ginger, cumin, and ¾ cup water. Add the onion and stir to combine. Place the chicken on top and season with 1 teaspoon salt and ¼ teaspoon pepper.
2. Cover and cook until the chicken is tender, on low for 7 to 8 hours or on high for 3 to 4 hours (this will shorten total cooking time).
3. Twenty minutes before serving, cook the rice according to the package directions.
4. Just before serving, add the yogurt and ½ teaspoon salt to the chicken and stir to combine. Serve with the rice and sprinkle with the scallions.
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