Glencadam Reserva de Porto - Tawny Port Cask Finish. With the Wood Finish series, Glencadam presents an impressive range of cask finishes that are neither coloured nor chill-filtered and bottled at drinking strength. The Reserva de Porto - Tawny Port Cask Finish first matured in American oak bourbon casks and was then finished in barriques previously topped with Tawny Port wine. Glencadam Reserva de Porto Branco. This single malt from Glencadam was matured in ex-bourbon barrels and finished in hand-selected white Port barriques from the distillery’s vast warehouses. This secondary maturation has added layers of cream and summer berries, with notes of baked apple, lemon meringue pie, apricot jam, raspberries and white pepper.