Preheat oven to 325°F (160°C).
Heat the cream: Pour cream into a saucepan. Split vanilla bean lengthwise and scrape seeds into cream. Add pod. Heat gently until steaming (do not boil). Remove from heat and let infuse 15 minutes. Remove vanilla pod.
Whisk egg yolks and sugar: In a bowl, whisk yolks, sugar, and salt until pale and slightly thickened.
Temper eggs: Slowly pour warm cream into yolks, whisking constantly to avoid cooking eggs.
Strain custard: Pour mixture through a fine sieve into a clean bowl to ensure smoothness.
Pour into ramekins: Divide custard evenly among ramekins.
Prepare water bath: Place ramekins in a large baking dish. Pour hot water into the dish halfway up the sides of ramekins.
Bake: Carefully transfer to oven and bake 40–45 minutes until custard is just set but still slightly wobbly in the center.
Cool and chill: Remove ramekins from water bath, let cool to room temp, then refrigerate at least 2 hours or overnight.
Caramelize sugar topping: Sprinkle a thin, even layer of granulated sugar atop each custard. Use a kitchen torch to melt and caramelize sugar until golden brown and crisp. (Alternatively, place under broiler for 1–2 minutes, watching carefully.)
Serve immediately to enjoy the contrast of creamy custard and crisp topping.