Noodle dish is sacramental at its core (5)

I believe the answer is:

ramen

I'm a little stuck... Click here to teach me more about this clue!

'noodle dish' is the definition.
(I know that ramen is a pasta dish)

'sacramental at its core' is the wordplay.
'RAMEN' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.

'is' is the link.

Can you help me to learn more?

(Other definitions for ramen that I've seen before include "Exotic dish" , "Oriental noodles" , "soup" , "Quick-cooking noodles" .)

I've seen this clue in The Irish Times.

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