Fried Onion Strings are a holiday ingredient used in many of Papa Louie's restaurant time-management games.
In Papa's Taco Mia HD/To Go!, Fried Onion Strings are a holiday-exclusive topping available during Starlight BBQ. They are unlocked with Matt when the player reaches Rank 7.
In Papa's Sushiria, Fried Onion Strings are a holiday-exclusive sushi filling available during Starlight BBQ. They are unlocked on Day 4 of the holiday.