Our being is aware.
The method to know this is: to be aware of awareness, and drop all speculation. At that moment of recognition, there is just awareness, pure awareness. There is no me, being aware: there is just pure awareness. The word pure is translated as Emptiness, or Shunyata in sanskrit. That is our absolute nature. The Awareness is our relative nature, and we can all know awareness quite easily, but we have to look into that awareness in order to realise our absolute essence.
We are pure aware beings, in a temporary body.
Know this, and you will know the nature of everything.