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Put the butter and 1 tablespoon of oil into a large sauté pan, for which you have a lid, and place on a medium high heat. Once the butter starts to foam, add the leeks, ½ teaspoon of salt and plenty of pepper. Fry for 3 minutes, stirring frequently, until the leeks are soft. Add the cumin, lemon and vegetable stock and boil rapidly for 4–5 minutes, until most of the stock has evaporated. Fold in the spinach and cook for a minute, until wilted, then reduce the heat to medium