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Blanch turnips for 3 to 5 minutes in boiling, salted water to cover.
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Drain, and place them in a medium saucepan with 2 tbsp butter and enough stock to barely cover them.
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Season with salt and pepper.
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Cover and boil slowly for 20 to 30 minutes or until they are tender but retain their shape.
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If the liquid has not evaporated, uncover and boil it off.
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Remove from heat, add the remaining 2 tbsp butter, the parsley and optional lemon juice and toss gently.
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Serve.