Editor's Note Some answers below recommend using a slow cooker with a frozen roast. This is not a safe practice as the meat comes up to temperature too slowly to avoid bacterial growth. The roast will be fully cooked but may make your family ill.
Here is a link from the USDA with more safety information:
Cook Slow to Save Time: Four Important Slow Cooker Food Safety Tips
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To make a tender roast put it into your oven frozen, yes frozen.
Place it into your cooking container garnish it with veggies, seasonings or what ever you like, pour in a can of beef stock (can use chicken stock too) and 1-2 cups of water (if the pot will hold it). Cover it and put in the oven on low (I put it on at 250 degrees F).
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When using your recipe for a frozen roast does it come out well or medium?
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Editor's Note Some answers below recommend using a slow cooker with a frozen roast. This is not a safe practice as the meat comes up to temperature too slowly to avoid bacterial growth. The roast will be fully cooked but may make your family ill.
Here is a link from the USDA with more safety information:
Cook Slow to Save Time: Four Important Slow Cooker Food Safety Tips
Most roast recipes come out medium.
Too many factors to be able to tell you for sure. Are you roasting in the oven or a slow cooker. Oven it will probable come out well done all depends on oven temperature and how long you leave it in.
It depends on the method of your cooking and how long you do it :)
If you want to cook it frozen, I'd cook it in a slow cooker on low for around 6 to 8 hours. You can always check this during the cooking process and remove it when you have the results you want.
When I've cooked roast in the oven or slow cooker, and even my Instant Pot, there has never been any pink in the meat, when I've followed the regular directions. The roast turns out soft and juicy each time. Hope that helps :)
Ive read that using a slow cooker with frozen meat can cause bacterial growth in the meat. Has that changed?
I have a pressure cooker at home that cooked a frozen roast as well.
The thing about a slow cooker like a crock pot is you don't get any kind of searing or "crust" on your roast. That is where a lot of the flavor comes from.
How large is the frozen roast that can be cooked for four hours?
According to this article, a 4 pound roast takes 2 hours. An 8 pound roast would take 4 hours.
basically the formula is for every 2 lbs of roast cook for 1 hour at standard baking time (IE 425 in case of meat)
I believe there are too many variables to give you a very accurate answer.