Wash tomatoes and chop roughly. Peel onions, bottle gourd, pumpkin, carrot and beetroot and roughly chop.
Add 1 cup water and pressure cooker for 1 or 2 whistle.
When it cools down, puree it in the blender and pass through a strainer.
In a wok, put oil and add crushed garlic and dried herbs. Saute for a while, add the strained tomato puree.
Add salt and sugar. If you have fresh herbs like parsley or basil, add at this stage.
Cook till the desired consistency is reached.
Lastly, add vinegar, stir and the sauce is ready. You can keep it in the refrigerator for up to 8 to 10 days.