Wash and pat dry the zucchini. Cut off the tops (reserve them for later) ans using a spoon, scoop out the pulp.
Finely chop the pulp. I used the pulp of only 2 zucchini.
Fry onion and garlic in some olive oil until golden and fragrant. Add in zucchini pulp, rice, tomatoes, olives and fennel seeds and cook for 4 to 5 minutes or until softened on a low/medium heat.
Stir in feta and cook for extra 1 to 2 minutes until feta starts to melt.
Stuff the zucchini and place them on the bottom of a deep baking dish. Pop the tops back on, if possible. Otherwise place them in the dish and pop them on just before serving. Drizzle with 1 tbsp of olive oil.