Sour lemon sauce for persimmon pudding

I made the lemon sauce for the persimmon pudding except for the zest because I'm afraid I'll shave off my fingers. The sauce is not a curd because it doesn't have eggs. It just has water, lemon juice, lemon zest, sugar and corn starch. You know the stuff you mix water with and its wet and dry at the same time. I played with that in kindergarten.