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One-Note Cook if it's because that's all the person cooking can make.
Beans/Coconuts can also become Does Not Like Spam for the character.
Radish Cure if they used to like them, but now they can't stand them after being stuck on an uncharted island with nothing else to eat for six months.
Sounds like you might want to shop around Deserted Island, Obsessed with Food, and their related tropes.
Also common in the Broke Episode. See Poverty Food, Bulk Buy Only.
I have a feeling that the trope is more about "sick of being vegetarian"...
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
Is there a trope where a character prepares to eat another canful of beans or a coconut, maybe having made numerous dishes out of coconuts, when they suddenly say "Beans / Coconuts for breakfast, lunch, and dinner? Again? I'm sick of beans / coconuts! If I have to eat another bean / coconut, I'll go crazy!"
This will usually result in the character seeking hunting an animal in pursuit of a meatier entree to eat anything beside beans or coconuts.