Touriga Nacional Touriga Nacional Overall Impression Touriga Nacional is a low yielding, small berried variety that produces wines that are intense, very tannic and well colored. This variety is used in red blends such as red Dão wines as well as being the most revered variety for making Port. Yeast Strain to Use: 4028 Red View Strain 4767 Dry/Fortified View Strain 4946 Bold Red/High Alcohol View Strain