In large pot over medium-high heat, bring all stock ingredients (except baby carrots) to boil. Reduce heat to low and simmer, covered, for 2½ hours. Taste broth after 1½ hours and adjust seasonings if desired. Strain vegetable stock and return broth to pot.
In small bowl, combine all matzo ball ingredients. Mix and cover with reusable wrap and place in refrigerator for 30 minutes.
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