Mom's Norwegian Meatballs with Gravy (Kjøttkaker med brunsaus)

INGREDIENTS

• 1/2 onion, skin removed but left in tact
• 1/4 teaspoon allspice
• 1/4 cup flour
• salt and pepper to taste
• 6 tablespoons butter
• 1/3 pound ground pork
• 1/2 cup whole milk
• dashes gravy browning agent (eg. Kitchen Bouquet)
• 1/2 teaspoon ground pepper
• 2 tablespoons red wine
• 1/4 cup sour cream
• 3-4 thin slices of gjetost, Norwegian brown goat cheese (optional, since this is an acquired taste)
• 4 cups chicken broth
• 1 egg
• 1/3 pound ground veal (if veal is unavailable use 1/2 lb each of beef and pork)
• 1/3 pound lean ground beef
• 1 teaspoon salt
• 1/4 teaspoon ground nutmeg
• 1/4 teaspoon ground ginger
• 2/3 cups Panko bread crumbs