Set up a double boiler by filling a medium pot with about an inch of water. Bring the water to a simmer over medium heat, then place a metal mixing bowl over the pot, ensuring the bottom of the bowl does not touch the water in the pot.
Add the chocolate to the double boiler, stirring occasionally with a baking spatula until the chocolate is completely melted. This will take about 5 to 7 minutes. Meanwhile, line a baking tray with parchment or a silicon liner.
Spread the melted chocolate out on the lined baking tray, sprinkle on the strawberries, pistachios, and the flaky salt.
Transfer the baking sheet to the freezer for about 30 minutes so the chocolate can set.
Use your hands to break the set chocolate up into "shards" of chocolate bark. Enjoy immediately or store in an airtight container in the fridge for up to a week.