Slow-Cooker Colombian Posta Negra Beef Roast Step-by-step instructions

Before you start

Before beginning, ensure the slow cooker basin is clean and dry. Prepare the beef by trimming any excess fat if desired, though some fat helps with moisture during the long cooking process. Grate the panela finely to ensure it melts smoothly into the sauce.

Peel and dice the onion and garlic into uniform pieces to ensure they cook evenly. Have all ingredients measured and ready to go before you start layering them into the cooker to ensure a seamless transition from prep to cooking.

Instructions

Preparation and Layering

1. 1Layering the ingredients
   Place the eye of round beef roast into the slow cooker basin. Add the grated panela, dark soy sauce, Worcestershire sauce, diced onion, and garlic cloves directly over the meat to begin the flavor infusion process.
   Look for Ensure the panela is evenly distributed over the surface of the beef.
   Tip Use a sharp knife to dice the onion finely so it incorporates fully into the sauce as it cooks.

At this stage, the slow cooker is filled with the raw roast, aromatics, and the base for the sauce. The panela should be sprinkled evenly over the beef, and the liquids added carefully.

Everything is ready to be covered and set to low, signaling the beginning of the long, slow transformation of the meat and the creation of the rich, dark glaze that defines this classic dish.

Slow-cooking and Reduction

2. 2Slow-cooking the roast
   Cover the slow cooker and set it to the LOW setting. Allow the roast to cook for 8 hours. Periodically baste the meat with the panela and soy mixture, ensuring the glaze reduces into a thick, dark, and glossy consistency that coats the beef thoroughly. Once the internal temperature reaches 145°F (63°C), remove the roast and let it rest for at least 3 minutes.
   Look for The sauce should be bubbling and dark, resembling a thick lacquer.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip Avoid opening the lid too frequently to maintain a consistent internal temperature throughout the cooking duration.

The roast has been simmering for eight hours, and the kitchen should be filled with a deep, savory aroma. The sauce has reduced into a thick, glossy lacquer that coats the meat. The beef is now tender and should be easily pierced with a fork. It is ready for the final step of resting and slicing before serving to guests.

Resting and Serving

3. 3Serving the Posta Negra
   Slice the rested beef into thick medallions, drizzle with the remaining panela-soy glaze from the cooker, and serve immediately while hot.
   Look for The beef should be tender enough to slice easily, and the sauce should cling to the meat.
   Tip Keep the glaze warm in the slow cooker if you prefer to serve it extra hot over the sliced meat.

The roast has rested for at least three minutes, allowing the internal juices to settle. The meat is now ready to be sliced into thick, beautiful medallions. Each slice is coated in the thick, dark caramel-like gravy from the slow cooker. The final dish looks professional, with the glossy beef ready to be served alongside your chosen sides for a complete meal.

Common mistakes

A common mistake is using light soy sauce instead of dark, which will result in a pale sauce that lacks the iconic Posta Negra color. Another error is failing to grate the panela; large pieces will not melt completely, leading to an unevenly sweetened dish.

Avoid lifting the lid repeatedly during the first few hours of cooking, as this releases heat and moisture, significantly extending the cooking time. Finally, do not skip the resting period, as it is essential for the juices to redistribute throughout the roast.

How to tell it’s done

To determine if the roast is done, use a meat thermometer inserted into the thickest part of the beef. It must reach an internal temperature of 145°F (63°C). The meat should feel tender and yield slightly when pressed with tongs.

The sauce should be dark, glossy, and thick enough to coat the back of a spoon. If the sauce seems too thin, you can remove the lid for the final hour of cooking to allow more moisture to evaporate and intensify the glaze.

• Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest