1) to be a viscosity solution to the $p$-Laplace equation, and

2) to possess an asymptotic $p$-mean value property in the viscosity sense.

I will explain the proof for $p \in (1,\infty]$ and show why the proof does not work in the case $p=1$. Moreover, I will discuss a generalization to the setting of Carnot-Caratheodory groups. The Euclidean part of the talk is based on Ishiwata-Magnanini-Wadade, Calc. Var. (2017), the second part is based on joint work with Adamowicz, Pinamonti and Warhurst.