Found this one, never heard of Boudin, so I'm not sure if it is what you are looking for. It is from www.recipezaar.com
Boudin Cajun Sausage
Ingredients
* 2 lbs ground beef * 2 lbs ground pork * 4 cups cooked rice * 4 large onions (minced) * 12 garlic cloves (minced) * 6 small hot chili peppers (Serrano, Etc) * 2 stalks celery (minced) * 1 large sweet red pepper (minced) * 1 large sweet green pepper (minced) * 2 medium leeks (minced) * 6 green onions (minced) * 1 cup parsley (minced) * 1/3 cup cilantro (minced) * 1 teaspoon red pepper flakes * 1 teaspoon black pepper * 2 tablespoons sugar * 1/4 teaspoon dried thyme * 1/4 teaspoon dried sage * 1/4 teaspoon dried rosemary * 1/4 teaspoon dried savory
Directions
1.Mix all thoroughly. Let sit overnight in refrigerator, then mix again. 2.Stuff into large casings, forming 6" links. 3.Cook what you need, and freeze the rest