Before serving, remove the custards from the refrigerator; let stand at room temperature for about 20 minutes. Meanwhile, place the 1/3 cup sugar in a small, heavy saucepan. Place over medium-high heat until sugar begins to melt, shaking saucepan occasionally to heat sugar evenly. Don't stir. After the sugar starts to melt, reduce heat to low and cook for 5 minutes more or until all of the sugar is melted and golden, stirring as needed with a wooden spoon.