Mimi's Frikadellen

Ingredients

• 2 pounds lean ground beef
• 2 pounds ground pork
• 2 medium yellow onions, very finely chopped
• 4 slices white bread, torn into small pieces
• 1/4 cup milk or water, warmed
• 2 large eggs
• 2 cloves garlic, minced
• 1/4 cup fresh parsley, chopped
• 3 teaspoons salt
• 1 1/4 teaspoons freshly ground black pepper
• 2 teaspoons yellow mustard
• 2 teaspoons dried marjoram
• 2 teaspoons Hungarian sweet paprika
• 1 teaspoon ground ginger
• 1/4 teaspoon ground mace
• 1/4 teaspoon ground coriander
• 1/4 teaspoon ground cardamom
• 6 tablespoons olive oil
• 2 tablespoons butter
• 8 kaiser rolls, optional, for serving
• fresh parsley leaves, optional, to taste, for garnish