Tangor's Workshop is a building in Moltara that combines Neopian items into something better. For example, If you combine a Shiny Obisidan with Scrap Metal, you get a val.
What Tangor says upon entering the shop
"Welcome to my workshop! This is where I do all of my tinkering and such. If you happen upon anything that looks interesting, bring it to me and I'll see what I can make of it."