I really like your idea, and I was also struggling to come up with an activity that is engaging for my less-than-enthusiastic technical high school boys. 

One thing I thought about (since they're all a bunch of jokers) is to have them use the ingredients they have in their picture to create a dish and draw it on a big piece of poster board which you could display in your room afterwards.  Have them write the ingredients used and the method of cooking.  They can display this when they present the other material in front of the class.  I was thinking of showing them an "epic meal time" video just to give them some inspiration and inspire them to come up with something wacky and over the top.  I'm sure the class would get a kick out of seeing everybody's ideas. 

I'm going to try this on Wednesday, but I would also like to hear anyone else's ideas or input on how to make this lesson a success.  I think the content has some great potential! 

Thanks OP for sharing

I agree that it would be cool to have them create a picture of what the average grocery for a week in Korea would look like.  I also love the idea of creatiing dishes!  I'll be using this sometime soon.

Do some information gap? Or comparative activities. They have to find 5 similarities and 5 differences, by asking questions while keeping their photos a secret.

I think the best idea is to use the original photographs, as a model almost, and do whatever activity you then want them to do for their own family/Korea (as suggested previously).

You could have students organize the original photos into 3 (or 4 or 5, who knows....) categories. Let students provide their own titles for the categories, and they have to explain their choice of groupings (off the top of my head: Healthy/Unhealthy, Processed/Unprocessed, Greasy/Sweet/spicy, Red/White/Orange.

Students have to order the photos from least expensive to most expensive (maybe useful as a warm up activity, or as some sort of activity if you are teaching money or numbers). Or a variation: you give them the total prices, and they have to assign the price to the photo they think it matches.

Peter Menzel has done some great stuff with this kind of photography project. I have used the "Material World" book for years to look at Cultural Differences/Values. Mainly, students get the photos of the households and have to identify different things in the photo and then think "what could that item tell me about what this culture/family/household values" (obviously I do my best to explain this is just one family- but they have been chosen as the typical family of that country...and I usually do this lesson sometime after doing the Stereotypes lesson). You can keep it as simple as household vocabulary, a spot the difference information gap as mentioned above, a general discussion (work in pairs, then do "Two lines" where the pairs are facing each other at the beginning, then one line moves one person to the right and talks to  a new person about their photo, then moves again one position to the right and talks again to a new person etc etc). I also would have students take a photo of their own living room/bedroom and then do the same activity (being aware of potential students who maybe are not so well off and might be embarrassed, so depends on your school/students)

Some of these ideas are really good, thanks all.

Just adding a relevant link---I stumbled across this lesson too late for me to make use of, but it looks like a great, complete lesson on World Food for higher level students, and it uses the Hungry Planet material. My guess is that it could be modified for lower level students using some of the ideas posted on here.