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Secure Erase Options

To secure erase when that option isn't available in Disk Utility.
For example, for SSDs.
Boot from another disk or recovery mode.
Erase the disk encrypted, with a complex key.
Fill the disk with zeros.
Erase it again, without encryption or with a different key.

Options to fill with zeros

If it is available, use mkfile, otherwise use dd...

mkfile SIZE FILE
Example: mkfile 200G File1
dd if=/dev/zero of=FILE bs=BLOCKSIZE count=BLOCKS
Example: dd if=/dev/zero of=File1 bs=1024 count=1000000