Hello Irina,
While the dozens and dozens of slide styles already included in the program are not geared specifically toward a food theme, they're no less useful.
Adding a splash of a few additional related elements might produce the results you're looking for.
Use of a food-themed dingbat font could be incorporated into the show to tie things together in that theme. One way to apply them is to display a food icon in a caption layer anchoring a couple of the corners of an image or line a few up at the side or bottom.
Those icons can also be transformed into a jpg using the right-click over preview screen capture feature and inserted as an image layer if you prefer placing them under other image layers instead of being stuck on top as caption layer.
A caption can be any color of course or be filled with any image or gradient using the texture on caption feature.
Here's a link to some food-themed dingbat fonts.
http://www.fontspace.com/category/food,dingbatsAnother thought might be to try out a fog/smoke transition in the show which might simulate steam, cooking or something like that. It's possible that transition is only available by the purchase of a transition pack though. I can't remember.
Good luck.