These links discuss taste changes and how to use seasonings and spices to enhance taste.

Metallic Taste
https://www.cancer.org/treatment/treatments-and-side-effects/physical-side-effects/eating-problems/taste-smell-changes.html
https://www.whatnext.com/blog/posts/15-ways-to-battle-metallic-taste-from-chemo
DIET AND NUTRITION
http://media.pancan.org/pdf/patient-services/booklets/Diet-Nutrition-Booklet-Digital.pdf
TASTE CHANGES
Use plastic or wooden cutlery
Sweeten foods that taste salty
Add salt, vinegar, lemon juice to overly sweet foods (if no mouth sores)
Marinate meat in fruit juices
Add spices and herbs to food
Lemon candies between meals
Keep mouth clean (non-alcohol rinse)