Put the porridge and coconut milk in a saucepan and add the zest of half a lime.
Turn the heat on, and simmer over low heat for 10 minutes. It should be creamy, so add a little more milk, if needed. Turn off the heat, give it a stir, then put a lid on and rest for 5 minutes.
Meanwhile peel the mango, and cut the flesh it into 1cm cubes. Put these in a small saucepan, add the zest and juice of the lime and the sugar. Simmer for 5/8 minutes, adding some maple/agave syrup to caramelize a little bit.
Scoop out the flesh of the passion fruit and add this to the compote (if used).
When the mango is tender and a bit sticky, turn the heat off and cover.
Spoon the porridge into bowls, top with the mango & lime compote and the syrupy cooking jus. Add more agave/maple syrup if needed.
Scatter some chia seeds over the mango compote and garnish with lime zest.