I haven't noticed it at my Sams's, but I'm going there for some corned brisket. I'll have to ask about it.
I've cooked on mesquite charcoal for years and love it. Right now I get the Lazarri in 40# bags for $19. It's not as sparky as some. All mesquite lump has big pieces, but I built a lump whacker to even things out.
KCBS - CBJ
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Oil Patch Horizontal
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Barbecue is not rocket surgery