Add the grated parmigiano to a bowl with the zest of 1 lemon, the juice of 2, honey, dijon, salt and olive oil. Whisk really well. Let it sit for 15-20 min.
Shave the fennel and squeeze a bit of lemon so it doesn't turn.
Add the arugula and fennel to a bowl. Massage dressing in, as much or as little as you want.
Shave more parmigiano on top and that's it.
