I just chopped off the leaves and I cooked it as a spinach. There is a lot of ways to cook it or use it as a spice (I like it on pizza) but the best way to eat the leaves and to get the most of it is to eat it raw. I often make a sweet salad (I chop the leaves and mix it with lime or lemon and honey, sometimes I add some fruits and seeds) or I just throw some leaves in the blender with some fruits and make a smoothie. Of course, it is possible to dry them out and make a tea out of it.
I always use the hole plant; I stored the stems and I'm going to use it when will make a cbd oil, I stored the root too. I cleaned it and I will dry it out then I will grind it and use it in some foods. But it has to be eaten raw so I usually pit it in a smoothie or just add a tablespoon of it at the end of the cooking. Just be careful with dosing because it has diuretic effects. One tablespoon per day should be fine.