It's been a long time since I've had fennel bulbs but damn I'd forgotten how unbelievably good they are roasted. The air fryer is far too filthy to use right now but I'd love to try it in there
Slice thinly across the grain and dress with olive oil/lemon etc. for a salad. I'm not a fan of them cooked - don't like the taste. Raw, they are nice and crunchy and refreshing in a salad with an aniseedy bite to them. Slices can be quick pickled and are wonderful with practically anything. Can be used as a celery substitute in almost any recipie I believe (except mirepoix but that may be just me). The green fronds can be used instead of dill, but will taste of aniseed. Pretty though.