01 - Preheat oven to 300°F. Arrange four 6 oz ramekins in a deep baking dish.
02 - Combine persimmon pieces, 2 tablespoons sugar, and lemon juice in a blender. Process until completely smooth.
03 - Distribute persimmon puree evenly among ramekins, spreading into a thin layer at the bottom.
04 - Combine cream and milk in a saucepan over medium heat. Bring to just steaming, watching carefully to prevent boiling. Remove from heat.
05 - Whisk egg yolks, 1/4 cup sugar, vanilla, and salt in a mixing bowl until pale and slightly thickened.
06 - Gradually pour hot cream mixture into egg yolks while whisking continuously to prevent curdling.
07 - Pour custard through a fine mesh sieve into a clean pouring jug to remove any cooked egg bits.
08 - Gently pour strained custard over the persimmon puree in each ramekin.
09 - Carefully pour hot water into the baking dish until it reaches halfway up the sides of the ramekins.
10 - Bake for 35-40 minutes until custards are just set with a slight wobble in the center.
11 - Remove ramekins from water bath. Cool to room temperature, then refrigerate for at least 2 hours or overnight.
12 - Sprinkle 1 teaspoon sugar evenly over each chilled custard. Use kitchen torch to melt and caramelize sugar until golden and crisp, or broil for 1-2 minutes.
13 - Let brûlée stand for 3-5 minutes to allow caramelized sugar to harden before serving.