Very strong coffee

What happened to my breakfast coffee? Did exaggerate the amount of coffee beans and forget milk? No!
This is my normal double espresso with milk froth. With stevia as sweetener. But not the normal little pills, the powder or the liquid.

Our eldest son has a stevia plant on his balcony. Recently he harvested the leaves, dried them, and then made the green powder that he passed on to me yesterday.
The coffee was normally sweet, so I didn't use too much powder. But obviously the dissolving was not as good as with the commercial stevia. But hey, this is home-made, so I like this so far more.