Cut the fatback into the thinnest possible slices. Cut the slices into very thin strips, and very fine dices. There should be about 3 cups. Set aside.
Put pork, beef, salt, pepper, and garlic into a mixing bowl. Add diced fatback.
Blend starch and ice water, and add to meat mixture. Cut the sausage casings into five lengths of about 18 inches each.
Outfit a meat grinder with a medium cutting blade and attach the sausage stuffer. Slip the sausage casing onto stuffer. Tie it at the end.
Add meat cubes with seasonings and liquid to the open feeder of the grinder, allowing the casing to be filled to a length of 15 inches. Tie end. Repeat this action with remaining casings. This will make about 5 sausages about 1 1/4 pounds each.
To cook the garlic sausages, bring a pot of water to a simmer. Add sausages and let simmer ( the ideal temperature is 180 degrees) for 30 minutes. Serve sliced. The sausages could also be grilled or smoked.