How can I make a material for jam? Well, I thought of something like this: 


But I couldn't figure out, how to achieve a similar material.
I messed around with the nodes and that's how my material looks like:


Can someone help me? -Thanks, beforehand.

(Sorry for my English, but I'm Austrian.)
Watch out, you have an unconnected socket shader socket in your node tree.

Anyway maybe mix a little translucent shader into your glass one. You setup looks quite good to me already, much of the remaining work needed is probably pertaining to setting up a proper scene and environment. "Jam in the void" will never look like proper jam.

You might optionally also want to add a particle system to your jam object to simulate the seeds in suspension.