Heat the olive oil in a medium saucepan over medium heat; add all the vegetables, garlic and onion. Season with the salt, and cook until tender, about 6 minutes. Add the pasta and cook until slightly toasted and golden, about 2 minutes. Add broth, and bring to a boil over high heat. Cook, covered, until pasta is just tender, about 8 minutes.
Stir in whatever herb suits you (or your young eater) and lemon juice. Season with pepper and additional salt, to taste. Fill thermos, pack in a lunch sack with crackers and cheese sticks and send off to school.
This soup freezes well, so freeze any leftovers or make a double batch to have plenty on hand. Also, you can stir in some cooked chicken or mini-meatballs, if desired, for another meal.
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