Have you ever seen the blog Food in Jars? A few weeks ago, she did a peach and yellow tomato jam, which would be interesting to do with Sungolds. She says not to peel or seed the tomatoes... The URL for this recipe is
http://foodinjars.com/2013/08/spicy-...ow-tomato-jam/
There's also this one, which calls for Sungolds:
http://foodinjars.com/2011/08/yellow...and-basil-jam/
I haven't tried this one... yet either.
I also make her "regular" tomato jam, and it is fantastic. It's in the recipe index.
Robin