Step 1

Preheat the oven to 200°C. Grease a 26cm loose-bottomed tart pan.

Step 2

Combine the stock and 1 cup (250ml) water in a saucepan over medium heat.

Step 3

Bring to a simmer, then add the polenta in a slow, steady stream, whisking constantly. Cook, stirring occasionally, for 10-12 minutes until slightly thickened.

Step 4

Add the parmesan and thyme. Season, then cook, stirring, for a further 2-3 minutes until melted and combined.

Step 5

Pour into prepared pan and bake for 20 minutes or until slightly crisp on the outside. Remove from oven and top with the onion, zucchini, capsicum, eggplant and bocconcini. Season well and drizzle with olive oil, then bake for a further 5-7 minutes until the zucchini is slightly tender and the cheese has melted.

Step 6

Remove from oven and allow to cool slightly in the pan.

Step 7

Remove tart from pan, scatter with olives and basil leaves, then serve.