Preheat your oven to 350°F. Toss ¼ teaspoon of the cinnamon with the coconut flakes in a bowl until they are coated and lightly toast on a baking tray in the oven (about 5 minutes). Remove and set aside.
In a small saucepan on medium heat slowly melt the sugar stirring constantly with a silicon spatula or a wooden spoon. The sugar should achieve a golden brown caramel color. Once the sugar begins to melt, do not walk away or you might risk burning it. Once caramelized, pour into the flan/pie pan and tilt to cover.
In a separate saucepan, combine the evaporated milk and coconut milk and slowly bring to a simmer.
In a mixing bowl, whisk the eggs for about 1 minute. Add the sugar, cinnamon, salt and vanilla and mix well. Now comes the tricky part: when you temper the hot milk mixture into the cold eggs. This step needs to be done slowly and carefully or your egg mixture will certainly curdle.
Pour your hot milk mixture into a Pyrex cup with a spout. Slowly, very slowly, pour in small amounts of the milk mixture into the egg mixture and whisk until it is fully incorporated. Repeat the process slowly, each time adding small amounts of your hot mixture into the eggs.
When all ingredients are combined, use a strainer to transfer the mixture into the pan you will be baking your flan in. Place the flan pan inside a roaster pan and slowly add warm water. The water level should come up about half ways up the flan pan. Bake until the center sets. Check at 30 minutes and about every 10 minutes after. You can use a cake tester to check for doneness. Flan should giggle slightly like jello when set.
*One important tip: Pull oven rack out and then fill the pan on the rack, this way you won’t have to transport it to the oven and risk dropping or spilling it.
When custard is done, remove from oven and allow it to cool at room temperature in the water bath. This will allow for cooling to take place gradually. You will notice small dark flecks, don’t be alarmed, the flecks are from the cinnamon.
Once flan is at room temperature place in the refrigerator for a couple of hours. To serve your flan, cut around the edges of the pan then carefully invert onto a larger plate. The flan will drop onto the plate and then sprinkle with the coconut flakes.