Botanical Tonic: The mildness with the botanical soul Meet me in the garden: sloe, elder and spruce needles combined with the natural bitterness of quinine, rosemary and juniper distillate do credit to the name Botanical Tonic. Together with trend-setting bartenders, Thomas Henry has developed a tonic for lovers of varied gin & tonics. With the excitingly mild composition of Mediterranean and local herbs, the Thomas Henry Botanical Tonic goes perfectly with floral and light gins - and also with light aperitif drinks with vermouth or other low-ABV spirits.