Sel Gris is a sea salt that is a by-product of making Fleur de Sel by evaporating basins of sea water. See "Fleur de Sel" entry for more information.
The theory is that it is the clay at the bottom of the basins, as opposed to the hundreds of sea-birds circling overhead, that gives this salt its flavour and grey colour.
Sometimes it is called Celtic Salt because the Celts, who lived in Brittany, France, have been making it for a long time, even before the Romans arrived there.
"Sel Gris" means "grey salt".
Literature & Lore
Sea SaltFleur de Sel; Hawaiian Black Lava Salt; Hawaiian Red Alae Salt; Maldon Salt; Sea Salt; Sel Gris
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Grey Celtic; Grey Salt