Coriander substitute?
The coriander seed has a fresh lemony flavor. I really dig it. It isn't very similar to the coriander herb, cilantro, but it has a similar freshness.

The problem is how you are cooking the meat. Coriander is dry and can be toasted; other substitutions such as herbs might burn.

These suggestion won't taste just like coriander but they are filed in similar categories in my mind. They would create the same mood.

If you need dry or toasted spice- such as for a rub you might try lemon-pepper or a little toasted fennel for the sweet freshness.

If this is a marinade and you aren't worried about burning the spices you could try lemon zest with a little cilantro.