Recalled verse concerning boring food for Muslim ascetics (9)

'muslim ascetics' is the definition.
'dervishes' can be an answer for 'ascetics' (dervish is a kind of ascetic). I am not certain of the 'muslim' bit.

'recalled verse concerning boring food' is the wordplay.
'recalled' is a reversal indicator (to recall can mean to bring something back).
'verse' becomes 'v'.
'concerning' becomes 're' (both can mean on a particular topic).
'boring' means one lot of letters goes inside another (to bore something can mean to drill into it).
'food' becomes 'dishes' (I can't justify this - if you can you should believe this answer much more).
'v'+'re'='vre'
'vre' back-to-front is 'erv'.
'erv' going within 'dishes' is 'DERVISHES'.

'for' is the link.

Can you help me to learn more?