set superusers="root"
password_pbkdf2 root grub.pbkdf2.sha512.10000.4039B6F2AC3D0E349479D2573BC4B206E022E9308DBCBA8F42FBBBF64B699B79A5426CE58503ACBB37CA4116CA1B95C89BEC5F804CB91C8ED5A7381C9E03EDE8.69E763E475CF993A6B4954F9BA863E45E8DFAF2BCEBEAAB21319DC766287FA1A621807F6E2AAD9277A6BA3B9B56A14C0918C441EE47BE304D23ADA562CA018E9