Golden wall recipe

[moogthedog]

So this chappie in the tundra has sent me off to build 10 floors and 10 walls of solid gold, but I don't have the recipe for the walls.

What's the best bet for finding the recipe? Bamli (for it is a granvil product), the rocky outpost things that provide the gold nuggets, or wander around either the Bawg or the Tundra on a generic killing spree?

Or is it a story drop?

[Iduno]

I found it after harvesting a lot of spurs (the thing you get gold from). There were just 3 other recipes I found first.