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"Eau de rose" ou "Eau de fleurs d'orangers" are products that are used in Middle Eastern/ North African cakes based from semolina or dried bread such as Basboussa or Qalb EL Louz or Khoubz Tounes. The products are water-based liquids to which water is mixed to a cold pressed oil from roses or orange flowers. The product is called "Mazhar" in Arabic and comes in a half pint bottles which are sold in stores carrying middle eastern products.
Vous n'avez rien compris! Les histoires à l'eau de rose are a specific genre of paperback books known in English as romantic novels.
L'expression 'à l'eau de rose' désigne un roman, une histoire un peu fade, mièvre, sentimental. C'est-à-dire gentillet, insipide, qui manque d'action etc (Wikipèdia)