Put the rice in the top of a double boiler set over simmering water. Add the salt and 3 cups of boiling water. Cover and cook until the rice is tender, about 30 minutes.
Stir in the condensed milk, butter, and raisins. Cook, stirring frequently, over simmering water until the pudding thickens slightly, about 20 minutes.
Remove the pot from the heat and stir in the vanilla and nutmeg. Spoon the pudding into individual custard cups and refrigerate until ready to serve. Invert puddings onto chilled plates and serve with fruit sauce.
Combine the orange juice, sugar, and cornstarch in the top of a double boiler. Cook the mixture over simmering water until it thickens.
Remove the pot from the heat and stir in the lemon juice, butter, and rum extract. Serve warm over rice pudding garnished with stewed fruit, if desired