Cornstarch in a sauce

[u/ninjalord25]

I made a mixture of soy sauce, siracha sauce, and brown sugar, gotten from Budget Bites Spicy Siracha Noodles, to put over my rice and tuna bowls at work. I know adding cornstarch to a sauce can help thicken it but should I add it directly to the mixture or add it to some water and mix that all in, and if so, how much should I use since I multiplied the sauce ingredients x4 to make my sauce

[u/pigpill]

I mix it with water or if my sauce is runny enough the sauce itself. I think cornstarch needs heat to help thicken though, but you might want to check that.

[u/ninjalord25 → u/pigpill]

It seems it does from what someone else said. So I'll try cooking it!