21 April dinner 'Swedish meatball'

When I went to IKEA, I ate 'Swedish meatball'. It tasted good and it was interesting that the meatball come with some blueberry jam. So, I tried to cook this!
Ingradients and Directions:
1. In the bowl, combine 300～500g ground pork, 1 egg, some bread powder, stir-fried 1 onion, some salt, 1/2 teaspoon black pepper, 1/4 teaspoon ground allspice, 1/4 teaspoon nutmeg.
2. Using your hands, shape the meatballs into rounds.
3. Heat the butter in the saute pan, add the meatballs and soute until golden brown on all sides. Remove the meatballs and place in the warmed oven.
4. Once all of the meatballs are cooked, add the flour to the pan. Whisk until lightly browned. Gradually add the beaf stock and whisk until sauce begins to thicken. Add some soy milk and continue to cook until the gravy reachesthe desired consistency. Don't allow the souce to boil because the soy milk proteins are separeted out.
5. Remove the meatballs from the oven, cover with the gravy and garnish with some blueberry jam.