Within your group you will need to assign the following roles:

Research Scientist http://www.cacs.louisiana.edu/~zwu/ResearchScientist.html

Assistant research scientist

Duties can include: Manage the day-to-day activities and administration associated with research project.
Liaise with key stakeholders to set timelines and ensure documentation and research activities are completed with agreed timeframes.
Work with the research team to develop and organize data collection processes.
Conduct on-site interviews with study participants.
Transcribe and analyse interviews.
Assist in the development of survey instruments and other data collection tools.
Assist with the preparation and delivery of project presentations and workshops.
Assist with the production of reports.

Dietician
http://www.daa.asn.au/

Nutritionist

http://www.pixeltech.com.au/~nutrition/links.html

Secretary

Locate recipes suitable for the above issues and present this as a group posting.

Explore some of these fantastic sites:

http://www.betterhealth.vic.gov.au/bhcv2/bhcsite.nsf/pages/bhc_recipes?opendocument

http://www.chefstoolbox.com.au/recipes.aspx

http://www.taste.com.au/recipes/collections

http://allrecipes.com.au/recipes/gluten-free-recipes.aspx

Nut-free recipes

http://www.cuisine.com.au/recipe-finder/no-nuts

These links to recipes are just some of the sites available. Of course you will have to locate other sites which would be suitable for other allergies.

Based on the recipes and research you have undertaken you will need to brainstorm and collaborate as a whole class which recipes will be used.