Caramelized Fennel Galette with Feta and Salsa Verde

I could write love poems about my relationships with the sweet, crunchy fennel bulb and I suppose this recipe could be interpreted as such. Filling a flakey butter crust with caramelized fennel and onions and and feta and topping it with a bright green fennel frond salsa verde is my way of showcasing and honoring this glorious vegetable.