Boiled Custard

Combine sugar, flour, and eggs in a large mixing bowl, whisking until well blended and smooth.

Pour the evaporated milk and water into a saucepan and heat over medium heat until small bubbles form around the edges, about 3-4 minutes.

Slowly pour the hot milk mixture into the egg and sugar mixture while whisking constantly to prevent lumps and incorporate the liquid gradually.

Return the entire mixture to the saucepan and place over medium heat, stirring constantly with a whisk or wooden spoon to prevent sticking and burning.

Continue cooking and stirring until the custard thickens enough to coat the back of a spoon, approximately 10-15 minutes total.

Remove from heat and stir in the vanilla extract, blending thoroughly.

Pour the custard through a fine-mesh strainer into a serving bowl or pitcher to remove any lumps or cooked egg pieces that may have formed.

Serve warm or chilled, depending on preference.