For the shortbread: Preheat oven to 190C/170C Fan/Gas Mark 5 and line a large baking tray with baking paper. In a large bowl, using a spatula or wooden spoon, cream the butter and sugar together until a smooth paste. Then mix in the flour until a soft dough forms. Roughly chop the chocolate and add into the dough, along with the rose petals (stalks and leaves discarded if using rose buds.)
Lightly flour your work surface and roll the dough out until roughly 1cm thick. Using a heart cookie cutter, cut out 9 heart cookies and place onto the prepared baking tray leaving space around each. Sprinkle each cookie generously with caster sugar, then place into the fridge to chill for 20 minutes.
Bake in the oven for 15-20 minutes or until lightly golden brown. Place the baking tray onto a wire rack and leave the cookies to cool completely.
To decorate: Melt the remaining white chocolate either in a microwave in 30-second increments, or using a bain-marie. Then place into a piping bag fitted with a small tip (or cut off the end to make a small hole). Drizzle the chocolate over one half of each cookie, and sprinkle some more rose petals on top. Leave to set.
Notes
Cookies will keep in an air-tight container for up to one week.
Keyword rose, shortbread, valentines, white chocolate