Well, I'm not a food photographer, so I hope someone else will chime in. But I disagree. I don't think the phone image looks better. The light looks flat and uninteresting. If you look at photos of food on TV or in cookbooks, they always glisten. They spray extra oil or water on them just to make sure that tomatoes and olives have those tiny, glistening reflections. It makes food appetizing.
I would actually try going for more shadows by lowering your ambient light. I also think your white balance might be slightly off...the colors of the food just don't look quite as deep and rich as they could be. I'd play with the post processing a bit more. The white balance of the phone photo looks correct to me, so maybe that's the difference you're seeing.
I think if you're going through all the trouble of self-publishing a cookbook, you owe it to yourself to accompany it with the best photos you can. I think with a little more practice, you'll be able to get there with your equipment. You've put so much work into it already, now is not the time to take the easy way out.