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Prepare all your ingredients: Chop into dice the onion, garlic & carrots. Rinse off the barley and set aside. Peel the potatoes, cube, and set in cold water with 1 teaspoon of lemon juice. (the water & lemon juice keeps them from turning brown until you add them to the soup)
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Heat a large dutch oven pot or large soup pot and add the olive oil, garlic and diced onion saute until the onions are transparent about 3 minutes.
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Add the carrots and saute for 3 minutes.
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Add the 2 cans of diced tomatoes, barley, oregano, basil, pepper, vegetable broth, and water. Stir, bring to a boil and then reduce temperature to low and cook for 30 minutes covered.
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Uncover, stir and add the potatoes, corn, peas and cook uncovered for 10 minutes or until the potatoes are fork-tender.
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Add 1 tablespoon of lemon juice to the soup, stir and serve with the chopped parsley.