Combine all spices in a bowl. Rub ribs on both sides with spice mixture.
In a saucepan over medium-high heat, combine the soy sauce, 2 cups of water, and the ginger and bring to a boil. Pour the mixture into the bottom of a roasting pan and place the ribs on a rack in the pan. Brush with the Chipotle-Molasses Sauce. Place in the oven and bake for 1 1/4 to 1 1/2 hours, basting every 15 minutes with the sauce.
Chipotle-Molasses BBQ Sauce:
Heat the oil over medium heat in a heavy-bottomed medium saucepan. Add the onion and garlic and cook until translucent, 3 to 4 minutes. Add the chili powders and cook for 1 minute. Add the tomatoes and water, bring to a boil, and simmer for 10 minutes. Add the remaining ingredients, except the peanut butter, and simmer for an additional 20 to 30 minutes or until thickened slightly, stirring occasionally. Transfer the mixture to a food processor with the peanut butter and puree until smooth. Season with salt and pepper, to taste. Pour into a bowl and allow to cool at room temperature.