Grease 6, 3/4 cup ovenproof ramekins, and place in large enough ovenproof pan.
Whisk egg yolks and 1/3 cup of sugar in a large bowl until sugar is dissolved and mixture is frothy.
Add next three ingredients, whisk until well combined. Carefully pour enough boiling water into pan until water comes halfway up sides of ramekins.
Bake in 325 degree F oven for about 40 minutes until almost set. Filling may wobble in middle, but will set upon cooling.
Remove from water, cool completely. Cover and chill for at least 6 hours, or overnight.
Divide and sprinkle the 1/4 cup of sugar over top. Broil on top rack in oven for about 3 minutes until sugar is browned and bubbly.
Let stand for 5 minutes before serving.