Mom's help! Baby food question!?

I have a six month old baby that started on solid food about 3-4 weeks ago. We did the regular transition from rice cereal (which he wouldn't touch) to oatmeal to veggies/fruits and now starting meats. I've been using the Gerber babyfood line. My son was exclusively fed up until we started foods and we're going to continue supplementing with milk till at least a year old. Here's my question: He HATES baby food...especially the meats. I asked dr if he really needed them (I'm a vegetarian) and dr said yes. I fed him a mushed up meatball from a can of spaghettios the other day and he thought that was the greatest thing ever. Would it be terrible to puree spaghettios and stuff like that for him to eat? I'm at a loss and basically every meal is becoming such a battle that we end up with a little oatmeal and back on the . Thanks in advance!