Heat the oil and fry the fennel for 3-4 min. until hot. Pour in enough boiling water to cover the fennel and simmer for 10 min.
lightly. Drain, reserving the cooking liquid.
Mash fennel and avocado with a tiny bit of cooking liquid to make a smooth creamy sauce. The sauce will be even creamier if you stir in yogurt or tofu. Season with salt and pepper and reheat gently before serving.