3.

Using tongs, discard onion halves, carrot, and basil. Add reserved tomatoes to sauce and stir to combine. Add fish sauce, if using. Season generously with salt and pepper and stir in minced herbs, along with additional olive oil as desired. Serve immediately, or allow to cool at room temperature, transfer to airtight containers, and refrigerate for up to 1 week. Sauce can also be frozen in sealed containers for up to 6 months. To reheat, warm very gently in a saucepan with 1/2 cup (120ml) water, stirring until it all melts and heats through.