1. Loosely coil 2 racks of back ribs or 1 rack of spareribs in each of two 1-gallon zip-lock plastic bags. Add 1 cup marinade and glaze to each bag. Seal and turn to coat. Chill at least 1 hour or up to 1 day, turning occasionally. Cover and chill remaining marinade.
2. Line two 12- by 17-inch baking pans with foil. Set a rack in each and coat with cooking oil spray. Lift ribs from marinade (discard marinade); set, meaty side up, in a single layer on racks.
3. Bake in a 425° oven until ribs are lightly browned, 20 to 30 minutes. Turn over and switch pan positions. Bake until ribs are browned on other side, 20 to 30 minutes longer.
4. Brush generously with reserved glaze. Continue baking, basting occasionally, until glaze is browned and bubbly, 6 to 12 minutes. Turn over and brush with more glaze. Bake, basting once, until glaze is browned and bubbly and meat between ribs is no longer pink in the center (cut to test), 6 to 12 minutes longer.
5. Transfer ribs to a board. Let rest 5 minutes. Cut between ribs to serve.
Ginger-hoisin marinade and glaze. In a blender, purée 1 cup hoisin sauce; 3/4 cup orange marmalade; 1/2 cup each soy sauce, rice vinegar, and chopped fresh ginger; 2 teaspoons fennel seeds; and 1/2 teaspoon cayenne.
Coconut-chutney marinade and glaze. In a blender, purée 1 1/3 cups coconut milk, 1 cup mango chutney, 1/2 cup soy sauce, 1/3 cup lemon juice, and 3/4 teaspoon hot chile flakes.
Per serving with ginger-hoisin marinade and glaze.