WHAT ARE BBQ RUBS AND HOW TO USE BBQ RUBS?

Spice rub is any mixture of ground spices that is made for the purpose of being rubbed on raw food before the food is cooked. In barbecuing, a rub is a mix of seasoning and flavoring ingredients that are combined and applied to the outside of meat like Pork, Beef, fish …. or poultry before cooking.

The spice rub forms a coating with many layers as favorites on the food. The food can be marinated in the spice rub for some time for the flavors to incorporate into the food or it can be cooked immediately after it is coated in the rub. The spice rub can be left on or partially removed before cooking.

Rubs can be wet or dry. Like brines, barbecue rubs consist of two primary flavors: salty and sweet. You can build on those, but salty and sweet are the foundation.

Ingredients: The spices are usually coarsely ground. In addition to spices, salt and sugar may be added to the rub, the salt for flavor and the sugar for caramelization. Different salts are sometimes used for their unique qualities, such as Himalayan pink salt or smoke salt. The simplest rub is just coarsely ground black pepper as in steak au poivre.

Spice rubs can also have ingredients such as herbs, dry chili, crushed garlic or oil added to make a paste. Less common ingredients can include coffee beans or any local ingredients.

RUBS ARE FOR WHEN YOU BARBECUE, NOT GRILL

Any discussion of rubs ought, to begin with clarifying the difference between grilling and barbecuing.

Grilling is a fast, high-temperature method suitable for cooking, for example, steaks or burgers or asia styles foods Street.

Barbecuing is a slow, low-temperature (typically 225 F) method you’d use to cook, for example, a whole pork shoulder or beef brisket or any method of low cook.

This is a huge difference and diversity, and its misunderstanding leads to the misconception that rubs should be used for grilling. No! Rubs, either wet or dry, are for when you barbecue, not grill which is mostly base on spice.  For high-heat grilling, stick to a simple seasoning of Kosher salt and freshly ground black pepper.

This is mainly because rubs will burn in the scorching heat of a grill, leaving you with a blackened, smoky mess. Sugar is one of the primary components of a rub and starts to burn at 265 F. Consider that steaks are grilled at 450 to 550 F, and even chicken is grilled at 350 to 450 F, and you’ll see why rubs and grilling don’t mix. So, use rubs for low-heat barbecuing and smoking, not grilling.

Flavoring Ingredients in Rubs

Beyond salt and sugar, other rub ingredients typically include garlic and onion powders, cumin, oregano, paprika, and chili powder. These last two contribute color as well as flavor. Color is important because, at 225 F, meat is not going to turn brown via the Maillard reaction, which happens at temperatures of 310 F or higher.

Since there is no set formula for the relationship between a piece of meat’s weight to its surface area, there is no formula for how much rub you’ll need per pound. You simply want enough to cover the entire surface. Any excess simply won’t stick and will fall off. Fortunately, dry rub keeps for a few months in a cool, dry place, so make extra.

We can, however, talk in terms of ratios. In general, a good rub recipe will combine equal parts (by weight) of salt, black pepper, sugar, chili powder (including paprika and chipotle powder) and aromatics (such as garlic powder, onion powder, cumin, oregano, mustard powder, and so on). 

Wet vs. Dry Rubs

In a sense, the choice of wet vs dry is mainly a choice relating to the flavor. Which is to say, there is no way to add the flavor of Worcestershire sauce without using Worcestershire sauce. And since Worcestershire sauce is wet, you’re using a wet rub. The same goes for citrus juice or vinegar.

Beyond that, liquid applied to the surface of a piece of meat is going to evaporate very quickly when exposed to heat. But though the liquid may evaporate, the flavor compounds it contained still remain. Thus the liquid is merely the medium for applying the flavor.

Oil (another liquid) doesn’t evaporate—but other ingredients don’t dissolve in it, either. Therefore, an oil-based rub (dry ingredients moistened with oil and formed into a paste) is using oil as a glue to adhere the dry ingredients to the surface of the meat.

And remember, the flavors of the rub aren’t going any deeper than the outer millimeter or two of meat. That’s why spice rubs need to be bold. You’re trying to apply enough flavor to the surface of the meat to season the entire meat.

Note too that when discussing the difference between wet and dry rubs, that is not the same as the difference between wet and dry barbecue. The former relates to the form of rub that is used, while the latter has to do with the use of sauce —either during the cooking, at the table, or both.

Sweetness Is the Key to Barbecue Rubs

Speaking of wet vs dry, molasses is a great ingredient for making wet rubs. As the byproduct of refining raw sugar into granulated white sugar, molasses functions both as a glue and as a medium for sweetness. And remember, because barbecue is a slow, low-temperature affair, you don’t have to worry about the sugar burning.

Brown sugar (which is what you get if you mix white sugar with molasses) is a standard foundation for dry rubs. Because it is slightly moist, it forms a good glue between the meat and other ingredients in the rubs. Maple sugar and turbinado sugar are also good choices. 

https://www.thespruceeats.com/barbecue-rub-definition-336237

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