Hi anons,
I'm traveling to the US for the first time in a couple of months. I'll be arriving in Miami, staying for 2 days, then heading to Washington, D.C.

I'm from a small country where we only have the usuals like KFC, Burger King, McDonald's...

What fast food chains, diners, or local stuff should I absolutely not miss while I'm there?

I'd love to try food that feels "American" or unique to those cities.

Bonus points for greasy, unhealthy, iconic stuff. Thanks.