Heat the olive oil in a large heavy-based saucepan over medium–high heat. Add the garlic, tomatoes, chilli and parsley stalks and stir for 20–30 seconds or until fragrant. Add the vongole and wine and allow the alcohol to bubble away for 1–2 minutes, then cover with the lid and allow the steam to open the vongole (this will take about 4–5 minutes).
In the meantime, grill the sourdough to your liking. (I love it a bit on the charred side.)
Once all the shells have opened, remove the pan from the heat. Discard any broken or unopened shells.
Tip the vongole and poaching liquid into a large sharing bowland season to taste, if needed. Scatter the parsley leaves on top and serve hot with the grilled sourdough.