01 - Preheat oven to 300°F. Arrange 4 six-ounce ramekins in a deep baking dish.
02 - Combine persimmon pieces, 2 tablespoons sugar, and lemon juice in blender. Process until completely smooth.
03 - Distribute persimmon puree evenly among ramekins, spreading into a thin layer.
04 - Heat cream and milk in saucepan over medium heat until just steaming. Do not boil. Remove from heat.
05 - Whisk egg yolks, 1/4 cup sugar, vanilla, and salt until pale and slightly thickened.
06 - Slowly pour hot cream mixture into yolks while whisking constantly to prevent curdling.
07 - Pass custard through fine mesh sieve into measuring cup for smooth texture.
08 - Gently pour strained custard over persimmon layer in each ramekin.
09 - Pour hot water into baking dish until it reaches halfway up ramekin sides.
10 - Bake for 35 to 40 minutes until just set but slightly wobbly in 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 over each chilled custard. Torch until golden and crisp, or broil 1 to 2 minutes.
13 - Let brûlée stand for 3 to 5 minutes to allow sugar crust to harden.