Using a double boiler set up, melt your white chocolate over medium-low heat.
When your chocolate is completely melted, pour the chocolate into the middle of a baking sheet lined with parchment paper
Use a spatula to spread the chocolate out evenly (It won't fill the entire sheet pan).
Then carefully top the white chocolate with the chopped pistachios, strawberries, rose petals and salt. Making sure to get all the corners.
Gently press the toppings into the chocolate (without smooshing them - just a light pressure).
Place the sheet tray into the fridge for 30-60 minutes, or until the chocolate has thoroughly set and is firm
Remove from the fridge. Place the bark onto a cutting board and slice into smaller pieces (I made squares here, but you can break apart the bark into more organic pieces or cut into any shape you'd like).