In a small saucepan, melt 2 tablespoons sugar over medium heat until it turns golden brown, stirring constantly to prevent burning.
Carefully pour the caramel into a small heatproof ramekin, swirling to coat the bottom evenly. Set aside.
2. Make the Flan Mixture
In a bowl, whisk the egg with remaining sugar until smooth.
Warm the milk slightly and gradually add to the egg mixture, stirring constantly.
Stir in vanilla extract and a pinch of salt, if using.
3. Cook the Flan (Stovetop Method)
