Sheet-Pan Chicken Thighs With Potatoes, Fennel, and Mustard-Beer Sauce Recipe

sliced crosswise into 1/8-inch-thick rounds

large, stalks, and root end trimmed and bulb sliced lengthwise 1/8-inch-thick, fronds reserved

bone-in, skin-on

finely grated, preferably with a Microplane grater

can, pilsner, or pale ale

coarse

or more to taste