String Beans with Onions

Cut String Beans and boil until tender, in Salted Water, &
letting the Water boil away to about 1 cupful.
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When done, add 1 Tbsp. Vinegar, thickened with
1 Tbsp. Butter rubbed with 1 Tbsp. Flour.
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Take from the fire.
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Mix with 1 Tbsp. finely chopped Onion.

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Serve immediately,

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without cooking the Onion.