Yesterday in the restaurant El Roser in l’Escala in Catalonia they handed us the “English” dessert menu. First choice was a Yarrow cake. Totally flummuxed we had to ask for a French translation- the French version was Mille Feuille. Instantly understandable.
Back home we discover that the plant Yarrow is of the genus Achillea Millefolium.

You cannot always rely on Google Translate.