[Tony watches Bucky with an expression of mild awe, because soldier or not, it's still surprising to see someone eat that food without flinching. What's wrong with everyone? Are they really just that used to accepting this all without question?]

If a cow suddenly dropped dead in front of me, I'd think it was more like a curse, not a blessing. But,

[There's a hint of humor in his answer here. Bucky offering that little piece of his life means a lot to Tony. It's a sign of trust, since he knows that the stories he and the others keep of the past are important. Almost sacred.]

I guess if you're interested in looking around, I can go with you. Let's see if we can find a metaphor.