Enjoying a bowl of ramen in Portland, Ore., a decade ago meant a trip to the supermarket for dehydrated instant noodles. But within the last few years, the City of Roses has become the City of Ramen as numerous noodle parlors pop up in seemingly every neighborhood. Part of the reason is the Pacific Northwest’s softer, largely mineral-free water, preferable for preparing delicate broths. Another might be that Oregon’s Asian population is the state’s fastest-growing demographic.