In a slow cooker, add the carrots, celery, white onion, garlic, chicken, lemon juice, ginger, oregano, sea salt, and black pepper. Cook on low for 5 - 6 hours or high for 3 - 4 hours until chicken is tender.
3 carrots, 3 celery stalks, 1 white onion, 3 garlic cloves, 1 ½ lb chicken breasts, 1 lemon, 1 tablespoon ginger, 2 teaspoon oregano, ½ teaspoon sea salt, ¼ teaspoon black pepper