Vollenweider's 2015 Wolfer Goldgrube Riesling Trockenbeerenauslese starts with super clear and precise stone fruit aromas on the nose but is even more concentrated and is also spicier than the corresponding BA. (My bottle was open for four weeks though.) On the palate, this is a gorgeous TBA, very concentrated, sweet and viscous but also with a remarkable total acidity of 15.5 grams per liter and very good tannin grip that obviously comes from the seeds. A great TBA that has been sold entirely to the UK. Total production: one glass balloon or 18 liters.