Mickey's Deli is great and the location is handy from the Strand.
However, my family and a few friends did a blind taste test of turkey sandwiches from many locations in Hermosa and surrounding territory.
The winner was Granny's Deli on Monterey between 6th and 7th Streets.
https://www.grannysdeli.com/

Doing these taste tests at a party are a family tradition.

BTW, the best chocolate chip cookies in the world are from the bakery at Lazy Acres market, corner of PCH and Artesia. They are the crack cocaine of cookies.