Preheat the oven to 325°F (160°C). Place four ramekins in a baking dish and set aside.
In a saucepan over medium heat, combine the heavy cream and sifted matcha powder. Heat until steaming but not boiling. Remove from heat.
In a mixing bowl, whisk together the egg yolks and sugar until pale and slightly thickened.
Gradually pour the warm matcha cream into the egg mixture, whisking constantly to avoid curdling.
Stir in the vanilla extract and strain the mixture through a fine-mesh sieve to remove any lumps.
Divide the custard evenly among the ramekins. Pour hot water into the baking dish until it reaches halfway up the sides of the ramekins.
Bake for 35-40 minutes, or until the edges are set but the center is slightly jiggly.
Remove from the oven and let the custards cool to room temperature, then refrigerate for at least 2 hours (or overnight) to set.
Before serving, sprinkle 1 teaspoon of sugar over each custard and caramelize using a kitchen torch until golden brown and crisp.
For the black sesame brittle, toast the black sesame seeds in a dry pan over medium heat for 2 minutes until fragrant.
Drizzle honey into the pan and stir until the sesame seeds are well coated. Cook for another 2-3 minutes until thickened, then spread onto parchment paper and let cool until hardened.
Break the sesame brittle into pieces and serve alongside the crème brûlée.