Swedish Meatballs

1 lb or 500g Ground Beef

1 tbsp Parsley Chopped

1/4 cup or 33g Bread Crumbs

1/4 tsp Allspice

1/4 tsp Nutmeg

1/4 tsp Garlic Powder

1/4 cup or 33g Onion Chopped

1 Egg

Salt and Pepper to Taste

5 tbsp or 75g Butter

3 tbsp or 38g Flour

2 cups or 500ml Beef Stock or Brown Veal Stock

2 tbsp Worcestershire Sauce

1/2 tbsp Soy Sauce

1 cup or 250ml Heavy Cream

1/4 tsp Mustard Powder

Salt and Pepper to Taste

2 tbsp Parsley Chopped