In a medium saucepan, bring the water to a boil. Stir in the sugar, cocoa powder, and a pinch of salt. Continue stirring until the sugar is completely dissolved.
Add the finely chopped dark chocolate and stir until it is completely melted and the mixture is smooth and glossy.
Remove from heat and stir in the vanilla extract and lemon juice. Allow the mixture to cool to room temperature.
Transfer the mixture to the refrigerator and chill for at least 4 hours, or preferably overnight, to allow the flavors to meld.
If you have an ice cream maker, pour the chilled mixture into it and churn according to the manufacturer's instructions. If you don't have an ice cream maker, pour the mixture into a freezer-safe container and freeze. Every 30 minutes, whisk the mixture with a fork to break up any ice crystals.
Before serving, let the sorbet sit at room temperature for a few minutes to soften slightly, making it easier to scoop. Garnish with cocoa nibs or chocolate shavings, if desired.
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