Consider using a method similar to the below for extracting the ingredients:
private static string ExtractIngredients(XElement v)
{
var ingredients = v
.Elements("ingrediens")
.Select(e =>
e.DescendantNodes().OfType<XText>().First().Value +
": " +
e.Element("mangd").Value);
return String.Join("\r\n", ingredients);
}
Here, you use the fact that the ingredient names are XML text nodes, and refer to them as separate children of the "ingrediens" node.