Heat sugar and water in a saucepan until it melts and turns deep golden.
Pour the caramel into my baking dish and tilt it to coat the bottom.
In a bowl, whisk eggs, condensed milk, evaporated milk, vanilla, and salt.
Strain the custard to remove bubbles or tiny egg bits.
Pour the custard over the caramel slowly so it settles evenly.
Place the pan into a larger one and pour hot water halfway up the sides.
Bake at 325°F until the center sets but still has a light wobble.
Cool the flan, then chill it for a few hours so the texture becomes silky.
To serve, run a knife around the edge, flip it onto a plate, and let the caramel run over the top.