I am cooking two three-rib roasts at the same time. Each weighs 7 lbs. In estimating the cooking time per pound, should I use 7 lbs or 14 lbs?
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Use 7 pounds! Going by 14 will overcook the two smaller roasts.
Chops is a trusted home cook.
And use a meat thermometer to check for desired doneness, 5 degrees less than done, cover with foil and let it rest before slicing.