Stir together lemon juice, corn syrup, soy sauce, salt, ginger, and corn oil in a bowl until smooth. Stir in the crushed pineapple with its liquid. Place the chicken legs in an ovenproof glass baking dish, and pour sauce over top.
Bake in preheated oven for 30 minutes, then turn the chicken over, and continue cooking until the chicken is tender, and no longer pink, about 20 minutes. Baste with sauce frequently while baking.