Vegan ideas preferred.
Tomato Fennel soup ... and freeze it for when you get back.
we love raw fennel, esp. when we travel- lightweight and refreshing. Otherwise, chop or slice and saute and freeze. you can make into soup or other when you return. To east before your trip, slice and put in salads; sautee and serve as a side dish; saute and use it as a bed under fish filets that you bake w/ or w/o tomatoey based sauce.
Throw it into a pot with any other vegetables you have left and make vegetable broth. Use up all the fridge items and have a clean fridge for when you get home.
Freeze and use in soup stock.