Peat is a compact mass of decayed and decaying vegetation that forms in wetland conditions. Scotland happens to have a large concentration of peat bogs and the country has used this peat as a fuel for ages. Malted barley is commonly dried atop a peat fire lending a distinctive smoky aroma to the barley. This barley is then used to make some Scotch whiskies and ales that have a hallmark smoky flavor. (Spirits/Ingredients)