Slow-Cooker Hawaiian Barbecue Ribs

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2 small racks baby back ribs (1 1/2 to 2 pounds each), cut in half

Kosher salt and freshly ground pepper

2 tablespoons vegetable oil

3 tablespoons ancho chile powder

2/3 cup teriyaki-style barbecue sauce (such as Sweet Baby Ray's)

1/3 cup apple cider vinegar

1 tablespoon grated peeled fresh ginger

2 cloves garlic, grated 

1/4 cup pineapple preserves

2 tablespoons ketchup

2 scallions, thinly sliced on an angle