Costco’s sliced sirloin steak is a great value and can make for a delicious meal when cooked properly. The key things to know when cooking this cut of meat are:
- Allow the steak to come up to room temperature before cooking
- Use a hot pan or grill to get a good sear
- Don’t overcook the steak – medium rare is ideal
- Let the steak rest before slicing and serving
Follow the steps below and you’ll have a tasty steak dinner in no time!
Ingredients
- Costco sliced sirloin steak, about 1 pound
- Olive oil or butter for cooking
- Salt and pepper
- Fresh thyme or other herbs (optional)
- Compound butter (optional)
Equipment
- Griddle or cast iron skillet
- Tongs
- Instant read thermometer
- Aluminum foil
Before Cooking
Take the steak out of the fridge and let it come up to room temperature, about 30 minutes. This will help it cook more evenly. Pat the steaks dry with paper towels. Generously season both sides with salt and pepper. You can also rub some olive oil or melted butter on the steaks to help promote browning.
If desired, rub some fresh thyme leaves or other herbs into the meat for extra flavor. Prepare any compound butter or other topping to be served with the steak.
Cooking Methods
You have a few options for how to cook the Costco sirloin steak.
On the Stovetop
Heat a cast iron skillet or griddle over medium-high heat until smoking hot. Add just enough oil or butter to lightly coat the pan. Carefully lay the steaks in the pan and let cook undisturbed for 2-3 minutes to get a good sear.
Flip the steaks and cook for another 2-3 minutes on the second side. Use tongs to hold the steaks up on their sides to render some of the fat. This will help develop a nice brown crust all over.
Continue cooking to your desired doneness, about 2-4 more minutes per side for medium-rare. Use a thermometer to check the internal temperature, aiming for 130-135 F for medium rare.
On the Grill
Preheat your grill to high heat, 500-600 F if using a gas grill. Clean and oil the grates. Place the steaks directly over the heat and grill for 2-3 minutes without moving to get grill marks.
Flip and grill another 2-3 minutes. Move the steaks to a cooler part of the grill if they are cooking too fast. Continue grilling until an instant read thermometer inserted sideways into the steaks reads 130-135 F.
In the Oven
Preheat your oven to 450 F. Place a cast iron skillet or oven safe pan in the oven as it heats up. Carefully remove the hot pan from the oven and add a small amount of oil or butter.
Place the steaks in the pan and return to the oven. Cook for 4-5 minutes then flip and cook another 4-5 minutes until done to your desired doneness. Check the temperature with an instant read thermometer.
Let it Rest
Regardless of cooking method, when the steaks are finished cooking, transfer them to a plate and tent loosely with aluminum foil. Let rest for 5-10 minutes. This allows the juices to redistribute through the meat for a juicier steak.
Serve and Enjoy
To serve the Costco sirloin steaks, slice them against the grain into 1/4 to 1/2 inch thick slices. Fan the slices out on a plate or platter. Top with a pat of herb compound butter if desired. Enjoy right away while the steak is still warm!
Leftovers can be refrigerated for up to 4 days. The steak is also great for meal prep lunches and dinners throughout the week. Simply slice, reheat, and enjoy.
Tips for the Best Sirloin Steak
- Pat the steaks very dry before seasoning and cooking. This will help achieve a better sear.
- Allow the steak to come to room temp before cooking so it cooks evenly.
- Use a thermometer to check for doneness. Medium rare is 130-135 F.
- Let the steak rest before slicing into it.
- Slice against the grain for a more tender bite.
- Add herb butter, chimichurri, or steak sauce for extra flavor.
Common Questions
What is the best way to cook sliced sirloin steak?
The best way to cook sliced sirloin steak is using a very hot pan, grill, or broiler. Get a good sear on the steaks, then finish cooking to medium rare doneness. Let the steaks rest before slicing and serving.
Should you marinate sirloin steak before cooking?
Marinating is not necessary for sirloin steak. A simple seasoning of salt, pepper, and any additional herbs or spices is all that’s needed. Marinades are better suited for tougher, cheaper cuts of meat.
How long should you cook sirloin steak?
Cook sirloin steak over high heat for about 3-5 minutes per side, until it reaches an internal temperature of 130-135 F for medium rare doneness. Cooking times will vary based on thickness and preferred doneness.
Is sirloin steak good quality?
Sirloin steak is considered a higher quality cut of beef. It comes from the hip/rear end section of the cow. While not as tender as cuts like ribeye or filet mignon, it has good flavor and can be quite tender if not overcooked. It offers a good value.
Should you wrap sirloin steak in foil while resting?
Yes, you should loosely tent the steak with foil while it rests. This traps in heat to allow the steak to continue cooking gently as it relaxes. It also keeps the surface from cooling too quickly. Rest 5-10 minutes before serving.
Nutrition Information
Here is the nutrition information for a 6 ounce sirloin steak cooked:
| Nutrient | Amount |
|---|---|
| Calories | 270 |
| Fat | 16g |
| Saturated Fat | 6g |
| Protein | 25g |
| Iron | 3mg |
As you can see, sirloin steak is a lean source of protein. It provides a good amount of protein while being lower in saturated fat than fattier cuts of beef. The iron content also makes it a nutritious choice.
Conclusion
Costco’s sliced sirloin steak is an affordable cut of beef that can make for a satisfying homemade dinner. Allow the steak to come to room temperature before cooking over high heat to medium rare doneness. Let it rest for 5-10 minutes before slicing and serving. Use a hot pan, grill, or broiler for best results. Serve with herb butter or chimichurri sauce and enjoy! Proper cooking is the key to bringing out the best in this tasty cut of beef.