Put the rice covered with cold water over the fire, boil 5 minutes, drain in a colander and rinse with cold water; return rice to saucepan, cover with water, add the salt and boil till done and thick; in the meantime melt the butter and add sugar; stir this over the fire till light brown; then add 3 tablespoonfuls boiling water and the juice; let it boil up, add the rice and let it remain a little longer over the fire; remove from the fire, mix it with the rum and put it on a glass dish in layers with fruit marmalade between it; let the last layer be rice; cover with the whites beaten to a froth, sweeten with sugar and flavor with vanilla; sprinkle over some finely chopped almonds, set it for a few minutes in oven, to take color, and serve when cold.