The easiest soup ever is probably Japanese ochazuke. Ochazuke means “soaked in tea” or something very close, and that is exactly what it is.
You take your rice left overs, in this case a mix of rice, beans and peas, and put in a bowl. Then you sprinkle with whatever you have lying around, in this case an actual ochazuke mix from the Korean supermarket with seaweed and little crunchy rice balls, plus shelled hempseed. My favorite topping is smoked salmon, but it’s expensive around here. Add some chili powder if you like. Pour green tea over it! My favorite is genmaicha.