Specify checker in vim/syntastic for Chef recipes

[Cbhihe]

Hello:
I am trying to configure vim/syntastic with a checker for Chef recipes.
For that I installed the lugin 'dougireton/vim-chef' inside my ~/.vim/bundle/ folder.
The plugin is correctly recognized by vundle.

How should I specify the checker under vim/syntastic ? In ~/.vimrc, I did:
let g:syntastic_[filetype]_checkers = ['foodcritic'] (1)
where it's not clear to me what filetype I should use.

vim-chef seems to specify ruby.chef as filetype but syntastic does not recognize the dot in (1).
Cheers.