Heat a large cast-iron skillet over medium heat. Add the ham steak and cook until browned on both sides, about 10 minutes, flipping several times. Transfer the ham to a plate and keep warm.
Pour the coffee into the skillet and bring to a boil. Scrape any bits of ham off the bottom of the pan.
Reduce the heat and simmer for 5 to 10 minutes or until the liquid reduces to about 1/2 cup. Serve the gravy piping hot.
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Notes
Ham: Ham steaks can be found in most supermarkets. Look for steaks that have a good amount of fat on the edges and through the center.
Coffee: Use black, strong brewed coffee. Avoid flavored coffee.
Storage: Store any unused gravy in an airtight container in the refrigerator for up to 3 days. Reheat when ready to use.