Whisk cornmeal, flour, salt, pepper, sugar, baking powder, egg, milk, and beer in a medium-sized bowl. Insert skewer lengthwise through the sausage and coat with batter.
Fry for 3 to 4 minutes, just until golden brown, and place on a paper towel-lined plate.
In a small bowl, combine crème fraîche, mustards, lemon juice, dill, and chives; season with salt and pepper to taste.