Method

1. Empty the tomato tins into a large bowl & pulverize the tomatoes with your hands until there are no large pieces left.
2. Turn your instant pot onto sauté (medium heat).
3. Add oil and butter, then add garlic and soften (around 2 mins).
4. Add oregano and cook for about a minute.
5. Meanwhile, chop the carrot and onion into large pieces.
6. Remove about 2/3 of the leaves from the basil and cut into ribbons.
7. Add the pulverized tomato to the instant pot.
8. Add the carrot and onion pieces, and the basil stalks.
9. Seal the instant pot and pressure cook for 45 mins.
10. Quick release the pressure and open the lid.
11. Use tongs to remove the carrot, onion, and basil pieces.
12. Add the fish sauce and chopped basil ribbons.
13. Season with salt and pepper to taste.
14. Switch to sauté to thicken (if desired).
15. To serve, heat sauce in a pan and stir in the pasta of your choice.