The precise amount of caffeine contained in green tea varies among different types of green tea. (med-health.net)
That article talks about the different types of green tea and the proper way of brewing it. (pathtofatloss.com)
The roasted green beans and broccoli can be replaced by any other roasted vegetables, and you can play around with the addition of other types of greens, herbs and spices. (golubkakitchen.com)