Measure out all ingredients: 2 cups of heavy cream, 1 cup of whole milk, 1/2 cup of granulated sugar, 1 tablespoon of agar-agar, one vanilla bean, and a pinch of salt.
In a medium saucepan, combine the heavy cream, milk, and sugar. Heat over medium, stirring until the sugar dissolves (2-3 minutes). Do not boil.
Prepare the vanilla bean by slicing it lengthwise and scraping the seeds. Add both seeds and pod to the cream mixture.
Cook for another 5 minutes over medium heat, ensuring it does not boil.
Dissolve the agar-agar in a few tablespoons of hot water in a small bowl.
Stir the dissolved agar-agar into the cream mixture and heat for an additional 2-3 minutes, stirring constantly.
Remove from heat and discard the vanilla pod. Stir in a pinch of salt.
Pour the mixture into individual ramekins and let cool at room temperature for 15-20 minutes before refrigerating.
Chill in the refrigerator for at least 4 hours or until set.
To serve, run a knife around the edge of each ramekin and invert onto a plate. Top with garnishes as desired.
Notes
For variations, consider adding citrus zest, herbs, or chocolate to the mixture.