Dice the pork and fat and freeze them for about 45 minutes to get them to a temperature of 32 degrees F (0 celsius).

Combine the pork, fat and crushed ice in a bowl and then, working quickly, grind the mixture through a 1/4 inch (6mm) die. Preferably grind the meat mixture into a bowl set atop an ice bath to keep the meat cold. Grind half of the ground mixture a second time. It is imperative that the meat be at a constant cold temperature so that the fat doesn’t get too soft. You should be able to see clear definition between the lean meat the specks of fat in the ground mixture.
Chill the meat in the refrigerator while you assemble the spice mixture.
Remove the ground meat from the fridge and place it on the stand mixer fitted with a paddle attachment. Add the spice mix and dry milk powder.

Mix the meat mixture with the paddle for 3-4 minutes until threads begin to appear in the meat: If you take a clump of meat and pull it apart with your fingers you will see tiny threads pulling apart. When you see this your meat is ready. If the meat mixture is too dry and stiff, add a little ice water.

Thread the sausage stuffer with the prepared hog casings, fill the sausage stuffer with the meat mixture, and stuff the casings being careful to avoid air gaps while also being careful to not over-stuff the casings.

Twist the sausages into links. Use a sausage pricker to prick any air bubbles out of the links.

Your Bratwursts are finished. For best results chill the sausages overnight.

Preheat oven to 300° F.
Beat sugar and eggs until frothy, fold in flour and a pinch of salt until doughy. Spread the dough evenly and as thick as a finger on a lined baking tray. Bake it for 18 minutes.
While it bakes, sprinkle a clean kitchen towel with sugar. Quickly topple the hot biscuit cake bottom onto the kitchen towel with sugar and roll the cake bottom in the sugar. Let cool down in this position. That way the cake bottom stays elastic and doesn't break once topped with cream and rolled.
While the cake cools, prepare the cream for the filling. Soak gelatin in cold water. Stir Raspberry Jelly Extra in metal bowl until smooth. Whisk whipping cream until stiff. Squeeze water out of gelatin and put gelatin into a ladle. Pour over hot water and stir until gelatin has dissolved. Slowly add liquid gelatin to the almost stiff cream. Add the lemon juice. Fold cream carefully into the preserve. Carefully stir raspberries into cream.
Heat Raspberry Fruit Spread until liquid and spread on the cake bottom. Let cool down briefly and spread raspberry cream on top. Roll back in shape and chill for about 3 hours.