In a mixing bowl, whisk together the egg yolks, granulated sugar, and a pinch of sea salt until well combined. If using a vanilla bean pod, scrape the seeds into the mixture, or add the pure vanilla extract.
Gradually pour in the heavy whipping cream while whisking continuously until the mixture is smooth and homogenous.
Divide the custard mixture evenly among your ramekins. You should have enough for about four servings, depending on the size of your ramekins.
Add 1 cup of water to the bottom of the Instant Pot. Place the trivet inside and carefully stack the ramekins on top.
Secure the lid on your Instant Pot and set it to cook on high pressure for 7 minutes. Once the cooking time is up, allow for a natural release for 5 minutes, then switch to quick release to let out any remaining pressure.
Carefully remove the ramekins from the Instant Pot and allow them to cool at room temperature for about 30 minutes. Afterward, cover and refrigerate for at least 2 hours, or overnight if you prefer.
Just before serving, sprinkle the turbinado or Demerara sugar (or granulated sugar) evenly over the top of each custard. Using a kitchen torch, caramelize the sugar until it turns golden brown and bubbly.
Allow the caramelized sugar to cool for a minute before serving, then dig in! Enjoy the satisfying crack of the sugar crust as you take your first spoonful.