@icedquinn
How long have you left it unsupervised? You need to stir that thing all the time.
@icedquinn
I don't know how much tomato sauce you were trying to do, but leaving the stove on high is not the best idea. And no matter what setting you leave it on, it doesn't change the fact that you do need to stir it every couple of minutes at least.
@icedquinn
The recipe sounds fine. It sounds like it's for a large quantity. You were the dumb one for not stirring. It's less important at the beginning, but it's crucial towards the end.