Holiday Bratwurst or Christmas Sausage?

My grandmother of German descent, used to put in an order with our local butcher during the holidays.

It was always referred to as Christmas sausage as I remember, and was a type of Bratwurst that was smoked. I'm wondering if anyone can help with a recipe, or memory of this tasty treat?

I remember it having mustard seed in it, and tasting somewhat spicy, black pepper and garlic maybe?

I've found many sites from Wisconsin selling different types of German sausages, nothing really stuck out as what I am looking for. I may just start ordering the smoked bratwurst from each site and try them all....

Any help is appreciated.