Sourdough has become popular during the COVID-19 pandemic. But for Ione Christensen, sourdough is not a new trend. The 86-year-old Whitehorse woman has baked with sourdough for most of her life.

Unlike most breads, sourdough doesn't use the kind of dry yeast you can buy at the store. It rises with the help of a starter, which is a fermented mixture of flour and water that, over time ...