Why did my beef back ribs turn to charcoal?

I found these beef back ribs in my local Costco and decided to pick them up. I found a recipe that: Uses a dry rub, grill for 2.5 hours Wrap in foil, grow for one hour (optional add coffee) Baste with barbecue sauce, grill for about 15 minutes per side. I went to check on [...]
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