I saw one advertised in a horsey mag the other week that had pieces of veg in it too - carrots and parsnips i think. Its soak time was about 30 mins i think!
The one with the veg in it is Equibeet + equiveg. It is new out, I got a sample of it at Burghley and my lot loved it, but the local feed merchants are still waiting for it to come in. I think it will be quite expensive though.