In a small saucepan add your cream, water, praline sauce, and cinnamon and bring to a simmer. Remove your pan from heat and let sit for 15 minutes, removing the cinnamon stick.
In a medium bowl, beat your eggs and gradually whisk in ⅓ of the cream mixture. Return mixture to saucepan and whisk.
Pour your mixture through a sieve into four 6 oz custard cups and place in a large roasting pan. Carefully pour boiling water into the pan so that the water reaches halfway up the cup. Cover your pan with foils to trap in the heat and bake for 40 minutes, or until the custards are set in the center. Remove and let the cups stand in the pan at room temperature for 15 minutes.