The thing about tannins

Tannins are naturally occurring substances found in grapes, tea leaves, coffee beans, cranberries, and various fruits, barks, and plants. Their primary evolutionary role was to discourage animals from consuming plants before they reached full ripeness. Despite this, many foods are celebrated for their tannin content. Items like wine, coffee, and dark chocolate contain tannins that enhance their flavors by introducing complexity and bitterness. Although bitterness is not a flavor most people actively seek, it can add depth to richer, high-fat foods, resulting in a more balanced flavor profile.
Red wines are particularly rich in tannins, making them an ideal match for many types of steak. Tannin molecules assist in breaking down the fat in steak, enhancing its flavor. Conversely, the fat in steak helps to soften the tannins in red wine, creating a harmonious pairing. Similarly, the tannins and acidity in coffee can provide a beneficial effect on your steak when used as a rub. Moreover, a coffee crust will impart a delightful charred flavor to your steak, elevating your dish to new heights.
Choosing your beans

When selecting beans for a steak rub, it's important to recognize that not all coffee beans are the same. Pay attention to the varying levels of tannins in different coffees, as those with higher tannin content will enhance your coffee rub. Opt for Robusta beans, which contain more tannins than Arabica beans. While Arabica beans are often preferred for drinking due to their smoother taste, Robusta beans offer a bolder, more bitter flavor thanks to their elevated tannin and chlorogenic acid levels. This makes Robusta beans perfect for creating a flavorful coffee crust on your steak.
You don’t have to restrict your coffee rub to just coffee. Incorporating ingredients like brown sugar can help caramelize the crust on your coffee-rubbed steak. Adding spices such as paprika and black peppercorns can further enhance the complexity of your rub, making your steak even more decadent. For cooking your coffee-crusted steak, a cast iron skillet is the best choice. This will allow your steak to develop a deliciously crispy crust while ensuring an even cook on your selected cut. Regardless of your cooking method, a coffee crust can elevate the flavor of your steak.
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