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I plan on cooking a prime rib for an upcoming dinner party for eight adults. I would like to have enough beef leftover to make a soup or stew. I plan on cooking the prime rib to medium rare. Is it best to calculate the amount by the number of bones per person or by pounds? How much prime rib should I purchase to feed my guests?

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Prime rib is not a good choice for soup or stew. It will dry out, it has no collagen to give unctuousness. Leftover prime rib is great for sandwiches though, or even salads. –  Jolenealaska Dec 30 '13 at 6:37
    
@Jolenealaska thank for the tip. I am still interested in leftovers even if I don't make soup. :-) –  ahsteele Dec 30 '13 at 14:29
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Prime Rib soup can be very good, especially if prepared with the rib bones that were carved away from a 'bone-in' preparation and then cooked in a pressure cooker to extract the prime rib flavor into a broth. –  Cos Callis Dec 30 '13 at 15:16

1 Answer 1

Prime rib is usually sold two ways, Bone-In or Bone-Out. For a Bone-In prime rib an 8 pound should serve you well, for a Bone-Out, Six will do nicely. I would also highly recommend you refer to the prime rib narrative of "Cooks Illustrated The New Best Recipe Book" to learn how to prepare your roast.

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Most restaurants that I have either had or seen Prime Rib served at will offer 10 oz or 12 oz serving size, with some variations in the overall 8-16 oz (225g - 450g) range. Appetites will vary from person to person, and you may wish to not serve the 'heals' as they will be more well done than the center, though some guests may prefer this..so, 'your-mileage-may-vary'. The very size of beef ribs makes serving them 'bone-in' impractical, as it results in a serving that is too thick for a single serving (though some restaurants do this for eye-appeal). For your home dinner party I would not recommend planning based on 'bone count'. Even if you buy and cook your roast "bone-in" your first cut after preparing and resting the meat should be to remove the bones from the roast. Since leftovers are goal you have set for this preparation you may wish to then slice the roast "on the bias" (about a 15°-20° angle from perpendicular to the bone section) as it will produce a larger footprint on the plate. The ends will provide you with good meat to include in a soup or slice up for sandwiches.

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Since we are intentionally over buying for leftovers what's the estimate amount per person? That way I can adjust for the next dinner party. –  ahsteele Dec 30 '13 at 14:28
    
@ahsteele meat portions between 100 g and 200 g pure meat per adult per meal are common, depending on the amount of other food in the same meal, which part of the world you live in, and the projected appetite of your guests (provide more for young males and people with recent physical activity). I normally calculate with 130 g muscle mass per portion. –  rumtscho Dec 30 '13 at 14:36
    
That thar would be 4-8 oz per adult, with a normal calculation of about 5 oz. :-) –  SAJ14SAJ Dec 30 '13 at 15:37

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