In a saucepan, bring liquid to a boil. Add the oatmeal and salt and stir.
Reduce heat to a low simmer. Cover and cook 10-20 minutes (depending on how chewy you like your cereal). Stir occasionally.
Remove from heat and let stand covered for a couple of minutes.
Stir in oil, balsamic vinegar, mango, and walnuts. Enjoy!