Grammaretto in future state that your accommodation is not suitable for people with special dietary requirements or fussy eaters. It sounds like you can cope with cold lodgers as long as they are willing to eat what's before them. As long as everyone knows the score up front, you shouldn't get fussy or vegetarian volunteers again.
Ah dear - why does getting older equate to diminished brain power?



but strict vegetarians require food to be prepared without any taint of animal products at all.

a working farm not wanting to pay a decent wage?