You're not going to get beer unless you specifically put something in there to do it. I'm trying to concoct a way to brew a green beer, the right herbs may do it. However I don't know how many that may take plus finding the ones that will be drinkable in such quantity. Maybe the right fresh leafy green veggies and steep out the chlorophyll. Japanese matcha tea, but that could be pricey. Plus it's gonna have to be a lighter beer so you're not having too many dark malts to overcome.