Put the raspberries into a zipper-locked bag, seal and crush them with a rolling pin until pulverized. Place the raspberries in a small frypan and over medium-high heat, cook for a few minutes ,stirring constantly until the raspberry juice has evaporated. Let cool. You should have 1/2 cup of raspberry purée. Mix the raspberry purée into the flour.
Using an electric mixer, beat the butter until it's soft and creamy, about 2 minutes.
Add the sugar, rose water and flour de sea and beat for 3 minutes.
Add the raspberry/flour mixture. Mix at low speed until the dough forms soft curds.
Divide the dough into 4 pieces and roll each piece into an 8-inch log.
Spread the sugar onto a piece of wax paper and roll the logs in the sugar until they're completely coated.Wrap each log in plastic wrap and refrigerate for at least 1 hour and up to 3 days.
To bake, set your oven to 325 F. Line your cookie sheets with parchment paper. Cut the logs into 1/2-inch thick rounds and place on the cookie sheets, leaving about 2 inches between each round. Bake for 20 minutes until the cookies are firm around the edges but the tops are still pale pink. Let them rest for a few minutes before slipping them out of the pans to cool.