Hello Hatty
You might consider using the new Cost of the Diet software developed by Save the Children to see whether and how a basket of foods meets specifications for energy, protein and micronutrients. Here is a link to a recent paper that describes the method: https://bmcnutr.biomedcentral.com/articles/10.1186/s40795-017-0136-4
The paper gives links to download the practitioners guide, both English and French versions, and register for the software, which is free.
If you provide a basket of foods you will need to find each one in the embedded food tables (there are >3000 listed or new foods can be added) and then enter the same nominal price for each food so that relative price is not an issue in the calculation and all foods have an equal chance of being included. You may want to adjust the number of times food are eaten in a week, to make the frequency of consumption is realistic, or just assume that the basket of foods is the only source of energy and nutrients and see how much has to be consumed to meet specifications, if it's possible. You can select from over 250 individuals to set the specifications for energy and nutrients for the calculations, or apply pre-selected standard families in the software.
The software applies the intake of micronutrients recommened by the WHO and FAO, the RNI, which is set at two standard deviations above the average (not at the average) to minimise the risk of deficiency. This means that the amounts exceed the requirements of 95% of people. The amount of energy however is set at the average, so only meets the needs of 50% of individuals. As the actual requirements for energy and nutrients of any given individual are usually unknown, the approach is based on probability, so I prefer to use the term 'specifications' rather than 'requirements'. The software also takes a probabilistic approach: users can adjust the RNIs in the software between the 1st and 99th percentile (the RNI is set at the 97.725th percentile), as well as many others, to do 'what if' calculations?
If you are concerned that amounts of micronutrients provided by the foods are grossly insufficient, you can add foods to the basket and see what happens. At that point cost may be an issue, so you may need to enter the actual cost per 100g of each food. The software could be a useful tool to help improve the nutritional quality of a food basket, if other foods can be added at low cost. The software, as its name implies, can help you estimate that cost.