I'm not sure what the command is either, but are you sure that menu.list isn't present on the mint install? I'd check that first.
Also Husse has written a: How-to repair grub on the wiki:
http://www.linuxmint.com/wiki/index.php ... _your_grub and there is this grub manual:
http://www.gnu.org/software/grub/manual/html_node/
Before I started however, I'd keep a Super Grub disk on hand (helped me on more than once)
Hopefully, you won't run into a UUID issue. Look at the Mint Wiki for more on that issue
http://www.linuxmint.com/wiki/index.php ... _a_problem
Or if you are sure you want to just do it ... I would make a copy of the current menu.list (call it something like: menu_old.list) and plunge right in.
Here's a copy of one of my menu lists. You'll need to replace the x and # notations for the device names and hd entries. Good luck.
# This is a divider, added to separate the menu items below from the Puppy
# ones.
title Other operating systems:
root
# linux installation on /dev/sdb5.
title Linux Mint, kernel 2.6.22-14-generic (on /dev/sdx#)
root (hd#,#)
kernel /boot/vmlinuz-2.6.22-14-generic root=/dev/sdx# ro quiet splash
initrd /boot/initrd.img-2.6.22-14-generic
savedefault
boot
# linux installation on /dev/sdx#.
title Linux Mint, kernel 2.6.22-14-generic (recovery mode) (on /dev/sdx#)
root (hd#,#)
kernel /boot/vmlinuz-2.6.22-14-generic root=/dev/sdx# ro single
initrd /boot/initrd.img-2.6.22-14-generic
savedefault
boot
# linux installation on /dev/sdx#.
title Linux Mint, kernel memtest86+ (on /dev/sdx#)
root (hd#,#)
kernel /boot/memtest86+.bin
savedefault
boot