McDonald’s is embracing the trend this Valentine’s Day with a limited-time McNugget Caviar kit. Lauri Patterson via Getty Images Papa Johns and Pizza Hut are offering heart-shaped pizzas for Valentine's Day. Casual, sit-down restaurants see the biggest lift in traffic, especially when Valentine’s Day is on a weekday, according to Circana, a market research firm. via Associated Press McDonald’s is embracing a fan-favorite trend this Valentine’s Day with a limited-time McNugget Caviar kit. AdvertisementMcDonald’s said it got the idea for caviar McNuggets from fans, who have been rhapsodizing about the high-low pairing for years on social media.