Place the chopped white chocolate and salt into a large bowl and set aside.
In a medium saucepan, over medium-low heat, combine the blackberries and cream.
As the mixture slowly heats up, mash the blackberries.
Once the mixture has begun to simmer, remove from heat.
Strain the blackberry/cream mixture over the chocolate with a fine mesh sieve. Press down on the blackberry mixture firmly with the back of a spoon to get out as much liquid as possible. Discard the remaining pulp and seeds.
Let the mixture sit for a minute or two. Add the vanilla bean paste.
Slowly whisk the ganache from the center of the bowl outward until the cream and chocolate are fully combined, smooth and melted.
If there are any pieces of unmelted chocolate, microwave in 20-30 second increments, gently whisking after each increment. Do not overheat or the ganache can split.
Pour the smooth ganache into the tart shell. Pop any air bubbles that rise to the surface with a toothpick.
Chill the tart in the fridge for 2 hours, or until set.
Decorate the tart with blackberries, mint, edible flowers and gold sugar pearls. Serve the tart chilled or at room temperature.