Take a medium saucepan and combine eggs, milk, yolk, sugar, salt, cornstarch, put on low heat, and bring it to a boil, constantly stir with a whisk ora spoon. When the mass boils, bubbles appear then add oil and vanilla, stir the mass, cook for 3-5 minutes, it will turn out very thick, normally cover it tightly with cling film, and remove to cool. After it, you should remove the pan from the heat, cover the cream tightly with cling film and remove it to cool to room temperature, you get custard – pudding.