In a saucepan, bring the almond (or coconut) milk and water to a boil, and then turn down the heat to medium-low. Add the steel-cut oats and salt, and stir well.
Zest the orange, and then cut it into segments. Add the zest and segments to the saucepan. Stir in the vanilla extract.
Steel-cut oatmeal generally takes 20 - 30 minutes to cook. As it’s cooking, add more almond milk if it looks as though the oatmeal is drying out.
When the oatmeal is close to being ready (about 5 minutes off), dice the plums and add them to the saucepan.
Once the oats have softened and are creamy, divide the oatmeal between two bowls. Top each bowl with a handful of shredded coconut, and enjoy!