Use flour in cold water allowed to sit for at least 20 minutes.
Yes, you can substitute arrowroot for cornstarch in this recipe.
Yes for sure. A lot of vegan recipes actually use arrowroot.
Yes.
custard
with arrowroot for thickening
yes
Arrowroot is a thickener like cornstarch and flour.
No. But cornflour is often used as an ingredient along with others to make a custard pudding.
Arrowroot powder is refined starch extracted from the tubers of an arrowroot plant.
I think the custard we make with milk and sugar is soft enough.
You could use the sentence, 'The custard was thick as mud.'