Rinse vegetables with water and roughly chops them into chunks or bit size pieces. Don't bother about the shape.
Heat olive oil in a big stockpot or casserole. Add ginger, bay leaf, cinnamon, thyme, celery, onion, carrot, and mushrooms. Saute them for less than a minute.
2 tablespoon olive oil, 2 bay leaf, 1 cinnamon stick, 2 thyme sprig, 1 tablespoon ginger, chopped, 1 whole garlic, cut into half, ¼ Cup chopped celery stalk, ½ Cup onion, roughly chopped, 1 Cup carrot, diced, 1 Cup button mushrooms, diced into quarters
Add water, coriander stalks, black peppercorns, and salt. Stir to combine.
½ Cup fresh coriander stalks, 1 litre water, at room temperature, 1 teaspoon black peppercorns, 1 teaspoon salt or to taste
Cover and simmer over low heat for 30 minutes. No need to stir the stock in between. Set a timer and forget about it.
After 30 minutes, turn off the heat. Allow the stock to cool down a bit so that it becomes easy to handle.
Arrange a strainer over a big bowl. You can add a layer of muslin cloth over the strainer. Filter the vegetable stock through the strainer. Mash the vegetables lightly if you prefer.
Vegetable Stock is ready to use and store. Before storing, allow the vegetable stock to cool down completely. Transfer it to a container with a tight-fitting lid. You can keep it in the refrigerator for a week, or you can freeze it in an ice tray.