In a medium sauce pan on medium heat put the cream, sugar and egg yolks in the pan heat slowly stirring constantly with a whisk until it comes to a light boil. Whisk together the milk and corn starch and add to the pan stir for a minute and turn off heat, add the vanilla. Divide the mixture into 4 ramekins and bake in a 275 degree oven in a water bath for an hour. Chill overnight
When ready to eat preheat the oven to a low broil. Mix together the butter, sugar, flour, and lemon peel. Divide the mixture over the 4 crème brulee and bake in the oven for about 8 minutes.