A good solid broth makes all things possible! And a vegetarian one is accessible to everyone. This recipe is very simple and can be personalized to your own taste or use case. The amounts shown are what I use for an 8-liter (roughly 8 quart) pot.
1-2 onions, root end trimmed and sliced in half
3 carrots, trimmed and cut into 3-4 pieces
4 stalks celery, trimmed and cut into 3-4 pieces
1 bunch parsley
1 clove garlic, lightly crushed
5-6 sprigs thyme
10 peppercorns
2 T salt
2 T soy sauce or tamari
Add all ingredients to a large soup pot, fill with cold water and bring to a boil. Reduce heat to a bare simmer and allow at least 2 liters to cook off. Filter and adjust seasoning as desired.