MacGourmet Deluxe can usually import many different MasterCook PC formats. You just need to export them from the Windows version of MasterCook correctly, usually using the MasterCook MX2, MasterCook MXP or MasterCook text formats.
Next you just transfer the files to your Mac (using a USB drive, your network, etc.), and then open them with MacGourmet, choosing format you used to export them from the pop up menu at the bottom of the import dialog window.
Note that files ending with a .mc2 file extension are MasterCook’s native binary files, and cannot, themselves, be imported by MacGourmet.