Riggwelter: from the Old Norse: rigg-back and velte â to overturn. When a sheep is on its back and cannot get up without help, local Yorkshire dialect says it is rigged or riggwelted.Riggwelter is a full flavoured strong Yorkshire ale brewed using the unusual Yorkshire Square fermentation system. The result is a well balanced, deep chestnut coloured ale.With it’s distinctive roast malt, Golding hops and banana fruit aromas, Riggwelter has a strong and refreshingly dry finish of hops and roasted barley malt.