Preheat oven to 325 degrees. Arrange 8 custard cups/dishes in a 13 x 9" metal pan.
Combine cream and lemon peel in a small saucepan and bring to simmer.
Whisk sugar and yolks in a separate bowl until thick, about 2 minutes. Gradually whisk in hot cream - a little at a time so that you don't scramble the eggs - then add vanilla and salt.
Let mixture stand for approximately 10 minutes.
Strain custard and divide among cups. Pour hot water (not boiling) from a kettle into baking pan - enough to come up half way on the cups, making a water bath.
Bake custard until just set in center about 45-50 minutes. Remove and chill uncovered at least 3 hours.
To make sugar crust, crush the light brown sugar (through a mesh strainer or with the back of a spoon) and divide between cups. Custards can be put under the broiler about 2 minutes or a cooks torch can be used. Chill until sugar is hard and crisp, about 1 hour.
Serve alone or with fresh berries.
Notes
You can make the custards a day ahead and after cooling, cover with plastic wrap until ready for sugar topping.