Preheat a cast iron grill pan on medium flame. In a small bowl combine the goat cheese, mozzarella, honey and lemon zest.

Butter the outside of each slice of bread. Scoop half of the goat cheese mix and spread on the inside of a slice of bread. Sprinkle with the mixed herbs and top with the remaining cheese. Top with the other slice of bread and grill on medium low flame until a nice golden brown crust forms on the outside and the cheese starts melting. About 2-3 minutes per side.

Allow the panino to sit for a couple of minutes for the cheese to set a little before cutting it in half.