Add in all other ingredients: lentils, canned diced tomatoes, celery, potatoes, garlic, seasonings, vinegar and lemon juice, and remaining four cups of broth. Give it a stir.
On manual mode, set your pressure cooker on high for 12 minutes.
After the veggie soup has come to pressure and counted down, allow a natural release for 10 minutes.
After you have allowed 10 minutes for natural release, carefully with a long-handled spoon or similar device, continue releasing pressure. Open your pot.
Depending on how thin you like your soup, you may want to add in a little vegetable broth. Add salt and pepper to taste.
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