Start by preparing the vegetables. You can chop them as roughly or as finely as you wish.
2 cups white button mushrooms, 1 carrot, 1 onion, 1 yellow bell pepper, 1 medium zucchini, 1 clove of garlic
Heat olive oil in a large saucepan and add the mushrooms first. Let them cook down for a little bit before adding the garlic and onion.
1/4 cup olive oil
Saute the mushrooms with the onions and garlic until they are almost soft. Now add the rest of the vegetables.
Add salt, pepper, and dried herbs to taste. Continue to cook for around 5 minutes on medium heat.
1 tsp dried Italian herbs, salt and pepper to taste
Add the tomato paste and let it cook for a couple of minutes before adding the tomato passata. Rinse out the bottle with water and add to the sauce. Bring the sauce to a simmer 1 tbsp tomato paste, 1 bottle tomato passata (680 grams/24oz), 1/2 cup water
Cover the sauce with a lid and let it simmer for at least 15 minutes.
Taste the sauce again to check the seasoning, and add more salt and pepper if needed.