Surface currents carry warm salty water from the tropics towards the poles. (oceanmotion.org)
I recommend rinsing out your mouth with warm salty water, then following up with a thorough brushing. (mindbodygreen.com)
Smaller, younger leaves may be better; a frost sometimes boosts the sweet side of Brassicas; or, soaking leaves in warm salty water for half an hour before roasting might be helpful. (mixedgreensblog.com)