Le Bristo on the Sun does have a surcharge. It is the same for lunch or dinner, $10 per person. Norwegian atlernates which resaurants are open for breakfast, lunch, and dinner. It depends if you are in port or at sea. You can look up the dining times in the newsletter each night.
When you board the ship you can make reservations or look at all the restaurants menus at the front desk in the main atrium. You can set up reservations for the entire cruise or one day at a time.
Alternate dining restaurants that have an extra charge are:
East meets West - $10 per person
Ginza - al cart
Le Bristo - $10 per person
il Adagio - $10 per person