As you note, it is somewhat difficult to understand what they are seeking, but in terms of food security assessment tools, three possibilities are:
US Government https://www.ers.usda.gov/Publications/EFAN02013/
For examples of completed assessments in practice, OCHA provides several https://ochaonline.un.org/rosa/FoodSecurity/tabid/5034/language/en-US/Default.aspx
Hi WFP (among others) have done a lot of work on this. some key approaches are here:
VAM (Vulnerability Analysis and Mapping)
- CFSVA - https://home.wfp.org/stellent/groups/public/documents/manual_guide_proced/wfp203193.pdf
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