Heat the olive oil in a large pan over a medium heat. Add the finely sliced chard stalks, 2 tablespoons of bone broth and a pinch of salt. Cover and cook for 15 minutes, stirring occasionally, adding a spoon of broth each time if more liquid is needed.
Stir in the garlic, nutmeg, dried herb mix, salt and pepper.
Add the sliced chard leaves and 2 more tablespoons of bone broth. Cover and cook for another 15 minutes, stirring often and adding more spoons of broth as required.
Add the fresh herbs and taste for salt and pepper. Top each serving with feta and a drizzle of olive oil.