Food ideas for 12 month old?

My son is going to be 12 months old on Friday. He has struggled with solid foods since introducing them because he feels nauseated due to medications (necessary meds). Me and his doctor agree he needs to have more solids in his diet but there is little he will take. Purees are out of the question he won't eat them. We need foods high in calcium, vitamin D, vitamin b-12, and high calories (due to how little he eats). Nothing citrus due to his medications. Any suggestions? I've asked his doctor and she sauys he can eat anything except citrus and can't have dairy after 6 PM but needs calcium and calories.