them? If your spaghetti sauce does not contain meat, the jars can be processed in a boiling water canner counting the time after the water returns to a boil. Process 500 mL jars 35 minutes, 1 L jars 40 minutes and 1.5 L jars 50 minutes. If the sauce contains meat, it should be processed in a pressure canner. In a weighted gauge pressure canner at 1,000 ft (305 m) process 500 mL jars 60 minutes, 1 L jars - 70 minutes at 10 lb. (69 kPa). Can I roast chicken legs from frozen, or partly frozen. A friend told me this was safe to do as long as the chicken is cooked thoroughly, but I'm not sure I agree. I would value your opinion. Thanks, Jackie If frozen chicken legs are thoroughly cooked without defrosting, they may cook unevenly. The outside will be well done while the inside is not cooked to a safe temperature. A food thermometer inserted into the meaty part of the leg should measure 170 o F /77 o C. Can you cook partly frozen meat? or do you have to wait until it is completely frozen and thawed? You can cook partly frozen meat but it is recommended that you thaw the meat first in the refrigerator prior to cook it.  The risk of cooking frozen meat is that the middle part of the meat might not be cooked properly.  Obviously, the cooking time will be longer.  You might want to use a food