Lamb shanks are the quintessential comfort food. Traditionally a tough, hardworking cut of meat, the shank is packed with connective tissue and collagen. When cooked quickly, it can be rubbery and unappealing. However, when you subject it to the low and slow magic of a slow cooker, that tough tissue melts away into a rich, velvety gelatin, resulting in meat so tender it literally falls off the bone at the touch of a fork.
If you are looking for a meal that feels like a warm hug on a cold evening, mastering the art of the slow cooker lamb shank is your best bet. This guide will walk you through everything from selecting the right meat to the science of the braise, ensuring your next dinner party or family meal is an absolute triumph.
Why the Slow Cooker is the Best Tool for Lamb Shanks
The slow cooker, or Crock-Pot, is uniquely suited for lamb shanks because of its ability to maintain a consistent, low temperature over several hours. This environment is necessary for the breakdown of collagen. Unlike a standard oven, which can sometimes fluctuate or dry out the surface of the meat, the sealed environment of a slow cooker traps moisture. This creates a self-basting effect where the steam rises, hits the lid, and falls back onto the meat, keeping it succulent throughout the entire process.
Furthermore, the convenience of a slow cooker cannot be overstated. You can sear your meat and prep your vegetables in the morning, set the timer, and return home to a house filled with the intoxicating aroma of rosemary, garlic, and red wine.
Selecting the Best Lamb Shanks
Before you even turn on your appliance, you need to start with high-quality ingredients. When shopping for lamb shanks, look for meat that is pinkish-red in color with creamy white fat. Avoid meat that looks grey or has yellowed fat, as this indicates it is past its prime.
Ideally, you want shanks that are roughly the same size. This ensures they cook evenly. Most shanks weigh between 12 and 16 ounces. If you are feeding a crowd, plan for one shank per person. While it might look like a lot of meat initially, keep in mind that the meat will shrink significantly during the long cooking process as the fat renders out and the collagen dissolves.
The Secret Step: Searing for Maximum Flavor
A common mistake many home cooks make is “dumping and going”—placing raw meat directly into the slow cooker. While this will technically cook the lamb, you will miss out on the Maillard reaction. This is the chemical reaction between amino acids and reducing sugars that gives browned food its distinctive flavor.
To get the best results, heat a tablespoon of oil in a heavy skillet over medium-high heat. Season your lamb shanks generously with salt and pepper. Sear them on all sides until they develop a deep, golden-brown crust. This doesn’t just improve the flavor of the meat; the brown bits left in the pan (known as the fond) are culinary gold. Deglaze that pan with a splash of wine or broth, scraping up those bits to pour into the slow cooker along with the meat.
Building a Flavorful Braising Liquid
The liquid in your slow cooker isn’t just there to keep things moist; it is the foundation of your sauce. A classic French-style braise usually involves a combination of red wine (like Cabernet Sauvignon or Syrah) and high-quality beef or lamb stock.
For a Mediterranean twist, you might add canned crushed tomatoes, oregano, and lemon zest. For something more aromatic and earthy, stick to the “holy trinity” of aromatics: carrots, celery, and onions (mirepoix), along with plenty of smashed garlic cloves and fresh herbs like rosemary and thyme.
It is important not to overfill the slow cooker. The liquid should come up about halfway to two-thirds of the side of the shanks. If you submerge them completely, you end up boiling the meat rather than braising it, which can lead to a less desirable texture.
Mastering Time and Temperature
Patience is the most critical ingredient when learning how to slow cook lamb shanks in a slow cooker. You generally have two options on your machine: Low or High.
For the most tender results, the Low setting is almost always superior. Cooking on Low for 8 to 10 hours allows the fibers to relax slowly. If you are in a bit more of a hurry, the High setting will take about 4 to 6 hours. However, be aware that at the higher temperature, the meat can sometimes become “stringy” if left too long.
A good rule of thumb is that the lamb is done when the meat has visibly retracted from the bone and can be pulled apart with a spoon. If the meat is still clinging stubbornly to the bone, it simply needs more time.
Finishing the Sauce
Once the lamb is finished, you aren’t quite done. The liquid left in the pot is incredibly flavorful but usually quite thin and potentially a bit oily.
Carefully remove the shanks and wrap them in foil to keep them warm. Strain the liquid into a saucepan and let it sit for a few minutes so the fat rises to the top. Skim off the excess fat with a spoon. Bring the remaining liquid to a simmer on your stovetop. You can reduce it by half to naturally thicken it and concentrate the flavors, or you can whisk in a slurry of cornstarch and water for a glossy, thick gravy.
Serving Suggestions
Lamb shanks produce a rich, heavy sauce, so you want to serve them with something that can soak up all that goodness. Creamy mashed potatoes are the traditional choice, but soft polenta or a buttery saffron risotto also work beautifully. To cut through the richness of the lamb, consider topping the dish with a “gremolata”—a fresh mix of minced parsley, garlic, and lemon zest. This bright, acidic pop balances the deep, savory notes of the slow-cooked meat.
FAQs
What is the best red wine to use for lamb shanks?
You want a dry, full-bodied red wine that can stand up to the strong flavor of the lamb. Cabernet Sauvignon, Malbec, or a Shiraz are excellent choices. Avoid sweet wines or very light wines like Pinot Noir, as their flavors may get lost during the long cooking process. If you prefer not to use alcohol, you can substitute the wine with extra beef stock and a tablespoon of balsamic vinegar for acidity.
Can I overcook lamb shanks in a slow cooker?
Yes, it is possible to overcook them, though it is difficult. If left on the High setting for too long (over 8 hours), the meat can eventually lose all its moisture and become mushy or “mealy” in texture. On the Low setting, you have a much wider window of perfection, but even then, more than 12 hours might start to degrade the texture of the muscle fibers too much.
Should I remove the silver skin before cooking?
Lamb shanks often come with a thin, pearly membrane known as silver skin. Unlike the thick white fat, silver skin does not break down during cooking and can become tough. While it isn’t strictly necessary to remove every bit, trimming the larger patches of silver skin with a sharp knife will result in a more pleasant eating experience.
Can I put frozen lamb shanks directly into the slow cooker?
It is generally recommended to thaw lamb shanks completely in the refrigerator before placing them in a slow cooker. Putting frozen meat in the pot can keep the contents in the “danger zone” temperature range (between 40°F and 140°F) for too long, which allows bacteria to grow. Furthermore, you cannot properly sear frozen meat, which means you’ll miss out on that essential browned flavor.
How do I store and reheat leftovers?
Lamb shanks actually taste even better the next day as the flavors have more time to meld. Store the shanks submerged in their sauce in an airtight container in the refrigerator for up to 3 days. To reheat, place them in a covered dish in the oven at 300°F until warmed through, or gently simmer them in their sauce on the stovetop. Avoid microwaving them if possible, as this can toughen the meat.