Swedish (Ikea) Meatballs - cooking recipe

Ingredients

2 tablespoons olive oil, divided
1 onion, chopped
450 g ground beef
450 g ground pork
1/2 cup breadcrumbs, homemade
2 egg yolks
1/4 teaspoon ground allspice
1/4 teaspoon ground nutmeg
1 teaspoon sea salt
1 teaspoon black pepper
4 cups gravy
60 g butter
1/3 cup all-purpose flour
4 cups beef broth (from 1 cube)
3/4 cup sour cream
1/2 teaspoon sea salt
1/2 teaspoon black pepper
2 tablespoons fresh parsley leaves, chopped

Preparation

In a large skillet saute onions in 1 tablespoon of olive oil, stirring frequently, for 2-3 minutes over medium heat. When onions become translucent, remove pan from the heat and leave them to cool a little.
In a large bowl, combine ground beef, ground pork, breadcrumbs, egg yolks, allspice, nutmeg, salt, pepper and cooked onion. Using a wooden spoon or clean hands, mix until well combined.
Roll the mixture into 1 1/4-to-1 1/2-inch meatballs (ice cream spoon helps to measure the amount needed for one meatball), forming about 24 meatballs.
Add remaining 1 tablespoon olive oil to the skillet. Add meatballs, in batches, and cook until all sides are browned, about 4-5 minutes. Transfer to a paper towel to get rid of any excessive fat.
To make the gravy, melt butter in the skillet. Whisk in flour until lightly browned, about 1 minute.
Gradually whisk in beef broth and cook, whisking constantly, until slightly thickened, about 1-2 minutes. Stir in sour cream; season with salt and pepper.
Serve immediately, garnished with parsley, and with cooked fresh pasta.