Vegan Split Pea and Barley Soup in the Pressure Cooker

I got home pretty late last night, but Bowie (the pressure cooker) came to my rescue and we had homemade soup in less than an hour.

1 lb split peas  
1/2 lb barley
2 T olive oil
1 med onion, chopped
1 small handful fresh thyme
2 stalks celery, chopped
1 cup chopped carrots
7 cups vegetable broth

Heat olive oil in bottom of pressure cooker to medium heat.  Add onions and celery and saute until tender.  Add remaining ingredients and cover.  Bring pressure cooker to high pressure (15 psi) and cook for 12 minutes.  Turn off heat and allow pressure to disperse naturally.  Add salt and pepper to taste.  Snarf it up!