Serve what you serve and thats it ... But on the days that he's there don't go all fancy .... Maybe home baked muffin and a fruit for snack or cheese cubes and crackers or yoghurt and a fruit .... To be totally honest my kids are not fussy eaters but they would not eat quiche and only one of my kids will eat a wrap but not with peanut butter and jam. For lunch maybe grilled cheese , spaghetti, scrambled eggs, ect ...... It's only one day a week and making sonething he likes is easier then stressing over it !