I attempted some more ribs, and think I finally have it nailed. Beautifully tender, great flavour and a nice smoke ring too! I was a very happy chap!

Cooked 2 hours over mesquite wood chips, then 2 hours foiled with honey, more dry rub, worcestershire sauce, apple cider and hot sauce, then another 1/2 hour without foil whilst I let the bbq sauce glaze set.
I'm hungry again just thinking about it!
Tom



