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Alex, this is an intriguing question.
Personally I consider grass to be the food of MY food.
As alpal said, grass is mostly cellulose which we can't digest. Cellulose needs temperatures over 315°C to break down so boiling in water will only give you wet grass, releasing little nutritional value.
The other problem would be nutritional value. Can you survive by eating only grass? Well alfalfa will give you 23-25 calories per 100 grams. So on an average day you're going to need to eat around 10kg of alfalfa to survive.
I wouldn't want to push that much material through my gut every day.
Chris
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