Or instead of spending so much time putting things on it you could just pick it up before he eats it?

There are normally two reasons why this happens

A learned behaviour, sometimes from mum as a pup but also occurs as a result of being reprimanded for soiling as part of house training. If the dog is punished for making the mess, hiding the evidence can avoid the unpleasant consequences.

I went through this and did a lot of research on the problem (coprophagia). Some foods that the dog finds hard to digest end up being expelled still containing plenty of nutrition and it is not uncommon for many wild animals to consume their own waste and digest it for a second time. It is just natures way of getting the most out of the food available. It is also common to find that a dog may be lacking in certain key elements of its diet and so eats its own waste in an attempt to fill the gap. This is where the myths about adding things to the diet comes in, yes they do solve the problem but not because they 'flavour' the waste, they just provide the minerals or elements that the dog is searching for.

In the end all I did was change my dogs food and bingo, cured over night.

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Have to agree with Jasper's Bloke above, this is a natural species response to a lack of nutrients in their diet. And whilst they can only feed on the food available, we can control what goes into our dogs' food and any addition will most likely add the extra nutrients they need, if it works at all.

Have a look at changing foods, and in the mean time, try and get her to go in a specific area so you can pick it up more easily.