Place the crushed pineapple with juice, soy sauce, honey, ginger and garlic in a large bowl and whisk to combine.
Place the chicken in the slow cooker, pour the sauce over and turn to coat.
Cook on low 4 hours or on high 2 hours, or until chicken is cooked through.
Serve over rice and top with extra sauce. Instructions to thicken the sauce if desired are below.
Thickening the Sauce (optional):
Combine 1 cup leftover juice, 1 teaspoon corn starch, and 1 teaspoon soy sauce in a sauce pan over medium high heat. Bring to a boil then reduce to a simmer until thickened.