Thanks for the reply.
This allowed me to boot my system to a working KDE session:
grub> set root=(lvm/fedora/root)
grub> linuxefi (hd0,gpt2)/linuz-4.14.13-300.fc27.x86_64
root=/dev/mapper/fedora-root
grub>initrdefi (hd0,gpt2)/initramfs-4.14.13-300.fc27.x86_64.img
grub>boot
I ran "grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg" and it seemed to
generate a valid grub.cfg file. Do I need to do anything else to utilize
that file, like a grub2-install ?
https://fedoraproject.org/wiki/GRUB_2