Note
Did you notice how Kantine and Essen melted into one noun meaning the food of the canteen?Breakdown of Das Kantinenessen ist immer das Gleiche.
ist
is
die/der/das Gleiche
the same
The gender of Gleiche depends on the word it refers to
If we are talking about das (gleiche) Mittagessen, we use das Gleiche
immer
always
das Kantinenessen
canteen food
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