Frikadeller (Danish meatballs)

• 1 pound (500 grams) ground pork

• 1 ½ teaspoons coarse ground salt

• ¾ cup (150 grams) onion, minced

• ¾ cup (85 grams) oats

• 2 tablespoons flour

• 1 egg

• Slightly less than ¾ cup (150 ml) milk

• ½ teaspoon oregano

• ½ teaspoon cracked pepper

• 1 tablespoon butter

• 1 tablespoon oil