Sanzo has odd tastes.
1. Sashimi, but you already knew that.
2. If the honey doesn't cut the sourness enough, he adds some mayonnaise to his sour plums too.
3. His companions. (What? It's a long journey, they're bored, there's nothing better to do and he likes the taste of mayonnaise.)
4. Ice-cream. Whipped cream is nasty, all sweetness and light.
When Koryuu was about five, he fell very sick with the flu. Koumyo Sanzo tried to make him chicken noodle soup with mock chicken and miso soup with non-dairy cream, but it was downright inedible and they ended up throwing it out. He found that stirring mayonnaise into ramen made something that looked a lot like it, and it didn't taste at all bad either.