Ingredients
-2 fennel bulbs (thick base of stalk), stalks cut off, bulbs halved lengthwise, then cut lengthwise in 1-inch thick pieces-Olive oil
-Balsamic vinegar
1. Wash and trim the fennel. Cut off the stalks and root end.
2. Cut bulbs in half and discard any tough outer layers. Slice as you would an onion, making thin rings.
3. Melt the butter in a heavy skillet over medium heat. Add the fennel and onion. Stir to spread butter. Reduce the heat to medium-low and stir occasionally until the fennel softens, about 10 minutes.
4. Add the sugar and salt. Stir as it cooks another 10 or even 20 minutes, until the fennel and onions are a bit brown and tender. The longer and slower over low heat, the better the caramelization.