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.
Arrowroot powder is refined starch extracted from the tubers of an arrowroot plant.
No. But cornflour is often used as an ingredient along with others to make a custard pudding.
I think the custard we make with milk and sugar is soft enough.
You could use the sentence, 'The custard was thick as mud.'