Drizzle a little olive oil over the bread and toast in a pan until lightly browned. Remove from the pan to cool.
Rub the garlic all over the sourdough until only half remains. Thinly slice the remaining garlic.
In the same pan, heat vegetable oil over a medium heat. Add the onion and cook until soft and translucent, stirring often so it doesn’t colour.
Stir in the remaining garlic and fry for a couple of minutes, until fragrant.
Add the prawns and cook for one minutes per side, ensuring that they don’t overlap.
Pour in the wine, increase the heat to medium-high and allow it to evaporate.
Add the tomatoes and crushed chilli. Lower the heat, cover and cook until the tomatoes have fallen apart and look saucy; add a splash of water if needed to help the sauce come together. Taste and season
Finish with chopped parsley and spoon onto the toasted sourdough.
Optional- finish with rocket, peashoots, avocado, or lemon.