For baked custard, no starch is used. The egg thickens it. For packaged custard mix such as Birds Custard, the thickener is cornflour or cornstarch and there is no egg.
Corn flour
To make puddings, or thicken recipes.
corn starch
Corn starch can be used in food, like to thicken gravy. Laundry starch has chemicals added.
A smart starch is a starch that can instantly change from powder substance to liquid form. These type of starches are commonly found in dessert dishes.
The starch found in the custard powder gives the structure to the product in which it is used. It also provides the light golden colour formed from the dextrinisation (application of dry heat on starch) process.
A mixture of equal parts water and cornstarch used in cooking to thicken sauces.
Corn starch thickens cheese sauce. Basic flour will do it also.
It will taste like garbage and it will be gritty.
Usually corn starch or arrowroot are the norm, but plain flour can be used but it has to be "merged" with the liquid first.
its called rue
Yes, that's what makes it thicken when it cooks.
The egg yolks provide the only fat in the filling, which is necessary for texture. Also, the egg yolks help thicken and bind the filling in recipes not calling for cornstarch or another starch. Without them, the filling would taste like a lemon gel, not a smooth custard, which is what the filling is and a custard, by definition, requires eggs or egg yolks.