Vegetable Broth

Adapted from The Oh She Glows Cookbook.

1.5 tsp oil
Coarsely chop:
3 onions
1 head garlic
salt and pepper
3 med carrots
4 stalks celery
1 bunch green onions
1 c shiitake or cremini mushrooms
1 large tomato
2 bay leave
10 sprigs thyme
1.5 tsp whole black peppercorns
2 tsp salt

Saute onion and garlic about 5 min. Season with a pinch or two of salt and lots of pepper.
Add carrots, celery, green onions, mushrooms, tomato, bay leaves, thyme and peppercorns and saute 5 or 10 more minutes.
Add 12 c water and 2 tsp salt. Simmer over low heat 90 minutes or longer. Strain.
Instantpot - I would try 1 hour.