Curate, connect, and discover
Hawks is a bird, right? And birds literally cannot taste spice that well, at all. In fact, birds are one of the biggest ways spicy jalapenos can even spread their seeds.
So, I like to imagine that this trait is something Hawks has, due to his Quirk. He can't taste spice at all.
To remedy this, I imagine Hawks, when he has the time, has made a home-made soup recipe for himself involving a fuck ton of Carolina Reapers.
It is so spicy, that it has been deemed, in Keigo's personal opinion, too hot for almost all human tongue, except his own.
The people who have tried it, Mirko and Best Jeanist to name a few, have actually gone red and teary eyed, losing their sense of taste for days afterwards.
But Keigo?
The little shit can't taste a thing. It's mild to him. And he adores this fact, because it means he can give unsuspecting friends/colleagues a small taste, and laugh at their reactions while giving them something to remedy the spice.
The only person who can thoroughly enjoy the taste with Keigo and have it also taste sorta spicy, maybe a bit more spicier than Hawks can because he's partially less bird, or maybe hasn't developed an immunity to spice due to being part bird, is none other than Tokoyami.