Easy Swedish Meatball Sauce

1 cup beef stock

1 cup heavy cream

3 tablespoons all-purpose flour

1 tablespoon soy sauce

1 teaspoon ground black pepper

½ teaspoon dried rosemary

½ (20 ounce) package frozen cooked meatballs, thawed

Whisk together the beef stock, heavy cream, flour, soy sauce, black pepper, and rosemary in a large saucepan until smooth. Cook and stir over low heat until thickened, about 10 minutes, stirring occasionally. Stir in the meatballs, and continue cooking until meatballs are heated through, about 5 more minutes.