MenuOption1

Course.cs

public class Course : ValueObject<Course>
{
    private readonly string name;
    private readonly int defaultPriority;

    public Course(string name, int defaultPriority)
    {
        this.name = name;
        this.defaultPriority = defaultPriority;
    }

    public int DefaultPriority
    {
        get { return defaultPriority; }
    }

    public string Name
    {
        get { return name; }
    }
}

Menu.cs

public class Menu : Entity<Guid>
{
    private readonly ICollection<MenuProduct> products = new Collection<MenuProduct>();

    public void AddProduct(MenuProduct menuProduct)
    {
        products.Add(menuProduct);
    }

    public void RemoveProduct(MenuProduct menuProduct)
    {
        products.Remove(menuProduct);
    }

    public IEnumerable<MenuProduct> Products
    {
        get { return products; }
    }
}

MenuProduct

public class MenuProduct : Entity<Guid>
{
    public MenuProduct(string name) : base(Guid.NewGuid())
    {
        this.Name = name;
    }

    public string Name { get; set; }

    public Course Course { get; set; }
}