01 - Preheat oven to 300°F. Arrange 4 ramekins (6 oz each) in a deep baking dish.
02 - Combine persimmon pieces, 2 tablespoons sugar, and lemon juice in a blender or food processor. Blend until completely smooth.
03 - Distribute persimmon puree evenly among ramekins, spreading into a thin layer at the bottom.
04 - Heat cream and milk in a saucepan over medium heat until just steaming—do not boil. Remove from heat immediately.
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 - Pour custard through a fine mesh sieve into a clean pouring jug to remove any lumps.
08 - Gently pour strained custard over the persimmon puree layer in each ramekin.
09 - Pour hot water into baking dish until it reaches halfway up the sides of the ramekins.
10 - Bake for 35-40 minutes until custards are just set but still slightly wobbly in center.
11 - Remove ramekins from water bath and cool to room temperature. Refrigerate at least 2 hours or overnight.
12 - Sprinkle 1 teaspoon sugar evenly over each chilled custard. Use kitchen torch to caramelize until golden and crisp, or broil 1-2 minutes under hot grill.
13 - Allow brûlée to rest 3-5 minutes before serving to let caramelized sugar harden.