Chill the Ingredients: Place the pork, beef, food processor blade, and bowl in the freezer for 30 minutes to chill.
1 lb pork shoulder, 1 lb beef chuck
Grind the Meat: Using the chilled food processor, grind the meat in batches until very fine. Transfer to a bowl set over ice to keep it cold.
Season the Meat: Add the salt, white pepper, onion powder, garlic powder, marjoram, and nutmeg to the ground meat. Mix thoroughly.
2 tsp kosher salt, 1 tsp white pepper, 1 tsp onion powder, 1/2 tsp garlic powder, 1 tsp marjoram, 1/4 tsp nutmeg
Create the Emulsion: With the processor running, slowly add the ice water to the meat mixture until it's smooth and paste-like.
1/2 cup ice water
Prepare the Oven: Preheat your oven to 325°F (160°C).
Fill the Loaf Pan: Lightly grease a 9x5-inch loaf pan. Spoon the meat mixture into the pan, pressing down to eliminate air pockets. Smooth the top and, if desired, make diagonal cuts for decoration.
Bake the Leberkäse: Place the loaf pan on a baking sheet. Bake for about 60-70 minutes, or until the internal temperature reaches 160°F (71°C).
Optional Browning: For a crispy crust, increase the oven temperature to 400°F (200°C) during the last 10 minutes of baking.
Rest and Slice: Remove from the oven and let it rest for 10 minutes. Carefully remove from the pan and slice as desired.
Serve: Enjoy hot with sweet mustard and a pretzel, or let it cool and serve cold in sandwiches.