Thinly slice 1 bulb of fennel. Depending on my mood I will use a mandoline for uniform super thin sliced or just wing it with a knife, if your slices are a bit thicker it will just take longer but you will save your fingers and potentially some money should you not own a mandoline..
Preheat a frying pan on medium-high heat and add 1 T of olive oil and 1 pat of butter (or more of whichever one you prefer to use).
Stir in 1/2 T of miso (or more, but no more than 1 T) until sort of dissolved and chuck in your thinly sliced fennel.
Lower the heat and gently let the fennel soften until seemingly forever, it should turn translucent and soft and start to brown.
Right before you think the fennel is about done, add in 1/4 C of Pineau de Charentes along with any fresh herbs, if using, and season to taste. If you don't have Pineau de Charentes (very likely), some vegetable stock, white wine or even just plain old water will also do nicely. The fennel is done when the liquid has mostly dissolved.
Serve on good toasted bread, maybe melt some cheese over the top or top with some good quality tinned sardines.