Mango Pudding (Flan de Mango)

INGREDIENTS

• 1 cup white sugar
• 1 tablespoon lemon juice
• 2 cups pureed mango
• 1 (14 ounce) can sweetened condensed milk
• 2 tablespoons cornstarch
• 1 tablespoon rum (optional)
• 1 cup evaporated milk
• 6 eggs, beaten
• 1 pinch salt