Easy Vegetable Broth

Ingredients (11)

• 2 tablespoons olive oil
• 5 cups coarsely chopped yellow onion (from about 2 medium)
• 3 cups coarsely chopped celery with leaves, ends trimmed (from about 5 medium stalks)
• 2 cups coarsely chopped carrots, ends trimmed (from about 3 to 4 medium)
• 3 cups coarsely chopped white mushrooms, stems trimmed (about 8 ounces)
• 6 fresh Italian parsley sprigs
• 6 fresh thyme sprigs
• 1 tablespoon whole black peppercorns
• 2 bay leaves
• 14 cups water
• 1/2 teaspoon kosher salt