I usually smoke them on 250 for about 4 hours. The slower they cook the more tender they will be.
I have a friend who is a gourmet chef and has won prizes for his ribs. He said that the numbers should multiply to 900. So, at three hundred degrees, it would be 3 hours. You have it at 400, so how long would it take to get to 900? 2 and 1/4 hours.
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i pray you dont burn the house down
I cook mine at 275
My mom boils them so the meat falls off then bakes or grills them
I usually cook them at a lower temp for about two hours, I also put water in the bottom of the roasting pan to keep them tender
between an hour and two...all depends on your oven