Recently did a moderately thin slice of the bulb then tossed with evoo and salt, tossed on parchment lined sheet pan and roasted in the oven until a good amount of browning occurred. Got some good concentration of flavor. Worked well with roasted salmon filets
My only mistake was not roasting the fish on the fennel fronds
Reading through this thread again - just bought two bulbs!
As an aside, I’m weirdly sensitive to cucumber, and have found that if I add raw fennel to something and eat it as a leftover a day or two later, it tastes like cucumber