Excess coriander in mutton curry
If the flavor is already in the dish, there isn't really a way to get it back out. You may be able to add more spices to bring it back into balance, but this is also likely to simply make all of the flavors equally overpowering.

If it is only the marinade that has too much coriander, you may be able to leave the coriander out of the remainder of the recipe.