Dunno if this helps or not, but I just bake our grain free sausages that look similar to that. Not for long, maybe 10-15 minutes. They usually come out pretty good. I have never been able to fry any kind of sausages without them being raw on the inside and burnt on the outside!
Have you had the salsa sauce raw before? Is that better?
Thanks for sharing your fails as well as your successes - it helps us all learn!
I usually just give the salsa a light turn through the pan to warm it over and get the butter all through it. Never had it raw. Not really game enough to try it yet.
The trick with frying sausages is to fry them S-L-O-W-L-Y so the heat can get all the way through. Otherwise you end up with the Mummified Backyard Banger.