Hot jalapeño peppers to finish with ... et voilà, Mexican food! (7)
I believe the answer is:
tostada
'mexican food' is the definition.
(I've seen this before)
'hot jalapeno peppers to finish with et voila' is the wordplay.
'to finish' suggests the final letters.
'with' says to put letters next to each other.
'et voila' becomes 'tada' (both might be said before presenting something).
The final letters of 'hot jalapeno peppers' are 'tos'.
'tos'+'tada'='TOSTADA'
(Other definitions for tostada that I've seen before include "Mexican topped pancake" , "spicy food" , "Crisp 15 down" , "Mexican food" .)