I was able to fix it post-install with the live cd using the following 
procedure:
(where sda3 is my trusty install and sda1 is the EFI system partition)

sudo mount /dev/sda3 /mnt
sudo mount -o bind /dev /mnt/dev 
sudo mount -o bind /sys /mnt/sys 
sudo mount -t proc /proc /mnt/proc
sudo cp /proc/mounts /mnt/etc/mtab
sudo cp /etc/resolv.conf /mnt/etc/resolv.conf
sudo chroot /mnt /bin/bash

apt-get install grub-efi-amd64
mount /dev/sda1 /boot/efi
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub 
--recheck --debug
grub-mkconfig -o /boot/efi/EFI/GRUB/grub.cfg
update-grub

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https://bugs.launchpad.net/bugs/1287573

Title:
  GRUB EFI fails to install on MacBook Air 5-2

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