It is helpful.. and I can illustrate just about anything you can think of. I will do the specific sandwich, soup, salad combo you are looking for.
What I mean but style is basically how you would like it to be colored/amount of detail you would like to see (more detail is not always/rarely better in a logo) . It is more about the over all feel of the company, than the specific products they produce.
The style I presented was a little more earthy and warm than a photo-realistic illustration of a bowl, sandwich, ect while combining a harvest of ingredients that could go into any good meal you would cook. Again, more of the idea and feel of your company rather than specific food items.
Anyway, take a look at the link (long , I know) and let me know if there are any styles of illustrations you prefer..not the specific type of sandwich, but just the overall feel of the image.
https://www.google.com/search?q=sandwich&hl=en&safe=off&prmd=imvnse&source=lnms&tbm=isch&sa=X&ei=Ni5iUJvwB4OS9gT65oDwBA&ved=0CAcQ_AUoAQ&biw=1076&bih=447#q=sandwich&hl=en&safe=off&tbm=isch&prmd=imvnse&source=lnt&tbs=itp:clipart&sa=X&ei=OC5iUN2yHoyY8gS1yYHACw&ved=0CD4QpwUoAw&bav=on.2,or.r_gc.r_pw.r_qf.&fp=250bd23a78779331&biw=1076&bih=447