Adobo seasoning is a Latino spice mixture used in various countries including Mexico. A typical "purchased" mixture may include garlic, onion, Tellicherry black pepper, Mexican oregano, cumin and cayenne red pepper. Use as a rub on meats prior to grilling or frying or use in taco meat mixtures. Although dry, prepared mixtures are available the traditional versions would be made from dried chiles, fresh garlic, oregano, tomatoes, onion, cumin, vinegar and sugar. (see recipe below).
This is a common spice in Mexican grocery stores. You can also buy Goya adobo seasoning online at Amazon.com. You may also find in the Mexican Foods section of a well-stocked grocery store.
Actual ingredients will vary by brand. The product shown is El Mexicano Adobo Seasoning: salt, chile pepper, onion, cumin, garlic, black pepper, lemon, sugar, beef base, paprika.