Kaya 2nd Attempt

Not long after I made my 1st double boil kaya(before that I always boil directly), I made my 2nd bowl of kaya. This time it was thicker. But when I started the double boil, I didn't turn the fire small enough. The kaya was boiling when I checked it half an hour later. Sob. When can I get it right?

Btw, the photo was taken with LX3.