XMLserialize object of list and string

So i need to xml serialize a generic list of objects where the object consists of another list and a string.

This is what i get now

    <?xml version="1.0" encoding="UTF-8"?>

-<ArrayOfRecept xmlns:xsd="http://ift.tt/tphNwY" xmlns:xsi="http://ift.tt/ra1lAU">


-<Recept>
<Namn>Nomnom</Namn>    
</Recept>

-<Recept>    
<Namn>Ännu mer nomnom</Namn>    
</Recept>

</ArrayOfRecept>

Here only the string value is serialized and not my List

This is my object that i want to serialize

public class Recept
    {

        private ListHanterare<string> ingredienser;
        private string namn;

        public Recept()
        {
            ingredienser = new ListHanterare<string>();
        }
        public ListHanterare<string> Ingredienser
        {
            get { return ingredienser; }

        }

        public string Namn
        {
            get { return namn; }
            set { namn = value; }
        }

    }

So I will have a list of Recept that i want to xml serialize and I want the xml to show both "Namn" and the "Ingredienser"-list.

This is my serializer

 class XMLSerial
    {
        public static bool Serialize<T>(T obj, string filePath)
        {
            bool bok = true;

            XmlSerializer serializer = new XmlSerializer(typeof(T));
            TextWriter writer = new StreamWriter(filePath);
            try
            {
                serializer.Serialize(writer, obj);
            }
            catch
            {
                bok = false;
            }
            finally
            {
                if (writer != null)

                    writer.Close();
            }

            return bok;
        }

    }

This is inside the ListHanterare class where I pass the object to the serializer

public bool XMLSerialize(string filePath){
            return XMLSerial.Serialize<List<T>>(lista, filePath);