Whisk the eggs: In a medium bowl, whisk 3 eggs until well beaten.

Add sugar and salt: Gradually whisk in ⅓ cup sugar and ¼ tsp salt into the eggs until the sugar dissolves.

Add milk and vanilla: Stir in 1 cup milk and 1 tsp vanilla essence. Mix until the ingredients are fully combined.

Prepare the mold: Grease a 6-inch mold or heatproof dish with oil to prevent sticking.

Strain the mixture: Strain the custard mixture through a fine sieve into the greased mold. This will remove any lumps or foam, ensuring a smooth custard.

Pop the bubbles: Gently pop any bubbles that form on the surface of the mixture to achieve a smooth top after steaming.

Steam the custard: Bring water to a boil in a steamer. Place the mold with the custard mixture in the steamer, cover, and steam over medium heat for 35-40 minutes.

Check doneness by inserting a toothpick into the center. If it comes out clean, the custard is ready.

Cool and refrigerate: Once cooked, remove the mold from the steamer and let the custard cool at room temperature.

Refrigerate for at least 1 hour to allow the custard to fully set and chill before serving.