Maintaining nutrition after having radiotherapy for oesophageal cancer. My partner is really struggling with his diet and I'm running out of ideas

My partner finished 20 sessions of radiotherapy for oesophageal cancer 13 das ago. He had managed really well, but is now struggling with his diet. He needed a feeding tube, but the discomfort and irritation of it made him gag and wretch so much the tube was removed. I am trying to maintain his weight, but running out of ideas. He cannot tolerate any warm food apart from fish in sauce. He is also a very fussy eater… does not like custard, milk puddings, pasta, cheese. I’m giving him complan drinks and fortisip. Has anyone got any suggestions of cold foods that can be mashed/liquidised that have decent nutritional values? He is refusing to have a further feeding tube.