Preheat oven to 425ºF / 200°C. Prick 1 large sweet potato multiple times with a fork and place on a baking sheet. Bake until tender, 45 to 50 minutes. (Alternatively, microwave on HIGH until tender, about 10 minutes.) Let cool for 10 minutes, then peel and discard the skin. You will need 280 g of the flesh for this recipe; reserve any extra for another use (see tips below).
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