Step #2 Heat the oil In a large-ish non-stick pan & carefully sauté the onion, garlic & seasonings until softish, zucchini, eggplant, capsicums, mushrooms, stirring every once in awhile.
Step #3 Place the tomatoes, feta, olives, basil & sautéed vegies into a bowl & toss well, then transfer the mixture to an ovenproof dish.
Step #4 Cut a pastry sheet to fit the dish & place it on top of the vegetables.
Step #5 Tuck in the edges & cook in the oven for 10-15 mins until the pastry is golden & has risen slightly.
Step #6 Allow the tart to cool a little & then invert it onto a large serving platter, so that the pastry is now on the bottom.
Step #7 Serve warm or at about room temp as a main dish for brunch or lunch or as a side dish served with other Mediterranean dishes, in which case it would serve more than 4.