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2 tablespoons refined coconut oil
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1 large yellow onion, finely chopped (about 2 cups)
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3 plum tomatoes, peeled and chopped (about 1 cup)
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3 garlic cloves, finely chopped (about 1 tablespoon)
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1 tablespoon grated peeled fresh ginger (from 1 [2 1/2-inch] piece)
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1 teaspoon ground turmeric
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1/2 pound dried red lentils (about 1 1/4 cups), rinsed and drained
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1 1/2 cups water
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1 1/2 cups well-stirred unsweetened coconut milk
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2 teaspoons kosher salt, plus more to taste
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1 teaspoon grated lemon zest plus 2 tablespoons fresh lemon juice
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1 teaspoon black pepper, plus more for garnish
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1/4 teaspoon cayenne pepper, plus more to taste (optional)
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Chopped fresh flat-leaf parsley, for garnish
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Steamed white rice, for serving