Preheat the oven to 200°C
Grease a 27cm loose-bottomed quiche pan
Place the stock and water in a saucepan and bring to a simmer
Add the polenta while whisking constantly
Cook, stirring occasionally, for 10minutes until thickened
Add the parmesan and thyme, season and stir while on the heat until well combined
Pour into the quiche pan and bake for 25 minutes until slightly crisp on the top
Remove from oven and allow to cool for 20 minutes in the pan
Carefully remove from the pan, place on a serving platter and spread the top with the pesto
Arrange the rest of the ingredients on top of the tart and serve immediately