Preheat your oven to 300°F (150°C) and arrange five 4-ounce glass jars on a baking sheet.

In a medium saucepan, combine granulated sugar and water over medium heat and stir gently until caramelized.

In a large mixing bowl, whisk together eggs and egg yolk until frothy, then heat milk and cream in a separate saucepan.

Slowly pour the warm milk mixture into the egg mixture, whisking continuously, then strain through a fine-mesh sieve.

Fill each jar with the pudding mixture, pour boiling water into the baking pan halfway up the sides of the jars, and bake.

Let the jars cool to room temperature, then cover and refrigerate for at least 3 hours.