In a pot, place some olive oil and add the sweet potatoes. Cook for about 5 minutes. Stir occasionally. Remove from the pot and set aside on a separate plate.
Add a little more olive oil to pot and the onion, cook for 4 minutes. Then add the curry paste, garlic, ginger, and turmeric. Cook for 1 minute.
Add the vegetable stock, salt, sweet potatoes from earlier, and lentils. Bring to a boil and reduce to a simmer. Cook for 20 minutes uncovered. Stir occasionally.
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