Oh, interesting, I have aleppo pepper but never heard of urfa biber. I love aleppo it has almost a citrus tang to it. I've had the Trader Joe's harissa it's good yea, they used to make an aleppo sauce actually but they stopped making it like 3 years ago, too bad it was so tasty on falafel :9 I'll check Alton's recipe and try your tasty alterations :)