You can watch the video in the post for visual instructions.
For the caramel, add sugar and water to a small saucepan. Bring to a simmer, stirring frequently. Once it starts boiling, turn down the heat, let simmer until it's dark golden brown and thickens, then turn off the heat.
Quickly pour the caramel into 4 small ramekins and spread the caramel around the bottom with a spoon or simply by tilting the ramekins. Set aside while you make the custard.
For the custard, add coconut milk, maple syrup, cornstarch, agar powder, vanilla extract, and sea salt to a medium-sized saucepan and stir with a whisk.
Once combined, bring to a boil over medium-high heat, stirring frequently. As soon as it starts boiling, turn the heat to low and let simmer for 2 minutes to activate the agar, then remove from heat.
Pour the custard into the 4 ramekins and refrigerate for at least 3-4 hours or overnight.
To unmold the flan, gently slide a knife around the edges of each ramekin. Invert a platter on top of the ramekin and turn the ramekin and platter over (shake it carefully). Check the step-by-step photos in the blog post above.
Enjoy! Store leftovers covered in the refrigerator for up to 3 days.