A recurring enemy in Square Enix’s Final Fantasy series, X is inspired by a dish dating back to the Roman Empire.
In the middle ages, in Spain, after the introduction of caramelised sugar to a then-called creamy dish gave birth to what we today know as X.
German for ‘flat cake’, X can be considered to be two different dishes based on where you order it from. In Latin American context, it is similar to a custard. Whereas in Britain, it is more similar to a tart.
“Two entrees. One X“ is cold.
However, in reference to the above line, X couldn’t possibly be had alone.
ID X.
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Don Quizote 
Creme brulee
Flan
jelly
CaRaMel
flan
Flan
This dessert-inspired Final Fantasy delicacy is Flan.
The line referenced in the question is said by Rosa Diaz in the show Brooklyn 99 when she finds her then boyfriend’s, Adrian Pimento’s receipt with “Two entrees, one flan.”