As the United States rethinks its role in the international order it has championed since the end of World War II, Japan is on the frontlines of the challenge to rules-based commerce and diplomacy.

Put into a saucepan with 4 tablespoons water and bring to a simmer. Cook for about 5 minutes, stirring often, until the apple starts to break down. Add a splash more water if necessary, but keep it to ...