For the last winter camp my theme was 'Travel the World'. Every day we did one or two different countries, organised around the continents. On the day we did Italy, I let the students make 'pizza' and on the day we discussed America we made candy (fudge).
Technically the pizza was just bread, with tomato sauce, cheese and an assortment of toppings: ham (which is a must), mushroom, onion, greenpepper, carrot (which my co-teacher insisted on), oregano, garlic, etc. You can used whatever you want, or what your budget allows for. I'm lucky in that my school lets me buy whatever I need. In any case, you will only need one of those small Korean-esque ovens for the pizza making activity and basic utensils. I had about 25 students in the class, divided into groups of 4 to 6. You can either prep the ingredients yourself or have each student in the group cut and prepare one of the ingredients. I did both, depending on the teacher involved. But most importantly, students get to choose their own toppings and make their own 'pizza'.
For the fudge you will need gasburners, but studens will gladly bring these themselves. You also need quite a lot of other utensils, but the ingredients are basic. Of course, your school or co-teacher might be finicky about such a 'dangerous' activity, but I didn't have any problems.
If anyone is interested in either recipe, let me know and I'll gladly post the camp plan. The students love these activities, I strongly suggest them.