Set the pot to saute and add the oil.
When the oil is hot, add the onion and fry until softened.
Add the garlic followed by the mince which should be roughly browned.
Now add the herbs, season all, beef stock, mustard and pasta. Push the pasta down into the liquid. Now add the tomatoes but DO NOT STIR.
Put the lid on and set to high pressure for 4 minutes. When the time is up, leave under pressure for another 4 minutes before doing a quick release.
When the pin drops, remove the lid and add the cheese. Stir together and put the lid back on loosely until the cheese melts (around 2 minutes).
Remove the lid and stir well together. Serve and enjoy!