(9:50 a.m. EST) -- In an effort to crack down on food waste, Holland America Line is testing a menu upcharge in the main dining room of four ships.

Passengers sailing on Nieuw Amsterdam, Eurodam, Zuiderdam and Oosterdam will notice the option to order a second entree for $10. First courses as well as starters, desserts and other menu items will continue to be offered on a complimentary basis, in traditional main dining room fashion; there will be no additional fee to order a second starter or dessert.

"Over the years we have upgraded the menu, and we have experienced that guests occasionally order additional main courses they simply can't finish," a spokesperson for Holland America told Cruise Critic. "Holland America Line has made great efforts to reduce food waste and with this we can better determine if guests who order a second entree will truly enjoy it."

One test involves charging $10 for a second entree only on Gala Nights, while a second trial charges $10 every night. Holland America plans to evaluate the results in late March 2019 and make a decision based on its findings.