How to mask the taste of iron?
Agree with the above posts as general guidelines but considering the taste buds it sounds like the "patron" does not like savory/umami flavors.

Best luck I've had for hiding the flavors of iron supplements is making smoothies; Citrus or some other very over-powering fruit.  Then the "meaty" flavour disappears in the smoothie thickener.

ie:
pineapple
Chocolate banna
orange
Berry (black berry, strawberry, etc...)

A homemade v8 blend / Bloody mary would be perfect also; if they love veggie taste.