Heat oil in a large pot over medium heat until oil is shimmering. Cook garlic in oil for no more than 30 seconds. Add all of the chicken to the pot; cook, stirring frequently, until chicken is white all over. Do not brown.

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Pour in soy sauce, vinegar, and water, and add the pickling spice. Make sure the spice ball is submerged. Bring to a boil, reduce heat to simmer, and place lid on pot so that some steam can escape. Simmer for 1 hour, or until chicken is very tender.