Sheep burger- suet or other binder?

[GoWyo!]

I finally bought a new grinder this fall. My son has been on a tear processing the two cow elk we killed a few weeks ago. He’s been making sausage and brats and burger. Found some mule deer that he’s ground up for the same. Now he’s moved onto some bags of big sheep grind. Which is reason for my question what has everyone used that has been blessed with a sheep. Beef suet, bacon, other binders? I’d love to hear your recipe.

Thanks.

Gary