1. While frying the chicken, you can do it till the outer coating becomes pale or slightly pinkish.
2. You can use upto 1/2 cup of sugar for the sauce, but I didn't because I was worried about how my folks would take it. However, I would say that 1/4 cup sugar used gave enough punch for the chicken.
3. Stirring in between is really important, so that the chicken doesn't get stuck and the sauce coats well.