WebAPI model binding complex type - JSON object to collection

Question

I have the following method signature on a WebAPI endpoint:

[HttpPost]
public async Task<IHttpActionResult> AddShopping(List<ShoppingList> shoppingList)
{

This is example JSON received in the POST body:

[
    {
        "name":"Bob",
        "items":{"food":"apple","quantity":1}
    },
    {
        "name":"Tim",
        "items":[{"food":"orange","quantity":3}]
    },
    {
        "name":"John",
        "items":[
            {"food":"banana","quantity":3},
            {"drink":"coke","quantity":2}
            ]
    }
]

Notice the first 'items' is an object and the second and third 'items' are arrays.

I want to bind it to this model, so the object in the first 'items' is put into the 'Items' List. If this is possible, how do I do it? Hopefully it's a matter of decorating the 'Items' property in the model with an attribute!

namespace Test
{
    using System.Collections.Generic;

    public class ShoppingList
    {
        public List<Item> Items { get; set; }
        public string Name { get; set; }
    }

    public class Item
    {
        public string Food { get; set; }
        public int Quantity { get; set; }
    }
}