I was all set to make the 2020 O'Leary Walker Watervale Riesling my wine of the week; having loved its freshness and clarity. I thought I'd better try its big brother first and viola: the best-value premium Clare Valley riesling shines again with its tightness, brightness and grapefruit citrus notes alongside chalky minerality. There is purity here, crisp acid on the finish and the wine is organically grown and made. If I had a case of this it would be gone before summer makes its bow. 95 points. $28. www.olearywalkerwines.com.