Dinner · Part 2 of 3: Instructions
Easy Slow Cooker Beijing Beef for a Savory Weeknight Dinner Step-by-step instructions

- Prep
- Cook
- Total
- Serves
- 4
Before you start
Before beginning, ensure all ingredients are properly washed and prepared. Slice the flank steak into uniform strips against the grain, which is crucial for achieving the correct texture.
Chop the yellow onions into thick, hearty slices that will hold up during the long cooking cycle, and cut the red bell peppers into consistent squares to ensure they cook evenly. Have the savory sauce measured and ready to go. Clear a space on the countertop for the slow cooker and ensure it is plugged into a grounded outlet.
Ingredients at a glance (4)
- 2 lb flank steak, thinly sliced against the grain
- 1 large yellow onion, cut into thick slices
- 2 medium red bell peppers, cut into squares
- 1 cup savory sauce, store-bought or made ahead
Instructions
Layering the Slow Cooker
- Prepare and Layer IngredientsPlace the thinly sliced flank steak into the bottom of the slow cooker insert. Distribute the thick yellow onion slices evenly over the meat, then scatter the red bell pepper squares on top of the onions to ensure even cooking.Look for The steak should be arranged in a single layer if possible for even heat distribution.Tip Slice the steak against the grain to ensure it remains tender after slow cooking.
At this stage, the slow cooker should be filled with the raw flank steak at the base, followed by the layers of yellow onion and red bell pepper. The ingredients should be neatly arranged to ensure that the meat is in direct contact with the heat source. Ensure that the power cord is clear of any water sources and the countertop is clean before proceeding to add the sauce and initiating the cooking cycle.
Simmering and Glazing
- Add Sauce and CookPour the savory sauce over the layered beef and vegetables. Cover the slow cooker with the lid and set it to cook on low for 4 hours until the beef is tender, reaches an internal temperature of 145°F (63°C), and let it rest for at least 3 minutes.Look for The sauce will begin to bubble and thicken slightly as the vegetables release their moisture.Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)Tip Avoid lifting the lid during the cooking process to maintain a consistent temperature.
During the cooking phase, the slow cooker will emit a savory, aromatic scent as the beef juices and sauce combine. The onions will soften and become translucent, while the bell peppers will brighten in color.
The sauce will begin to thicken as it bubbles gently. Check that the lid remains firmly in place and that the appliance is set to the correct temperature setting to ensure the beef reaches its safe internal temperature.
Final Resting and Serving
- Rest and ServeOnce the cooking time is complete, ensure the beef is tender and the sauce is glossy. Allow the beef to rest in the slow cooker for at least 5 minutes before serving to ensure maximum tenderness.Look for The sauce should be glossy and coat the beef and vegetables thoroughly.Tip Serve warm over steamed white rice for a complete meal experience.
Once the cooking is complete, the beef should be tender and coated in a rich, dark glaze. Allow the dish to rest for at least 5 minutes, which helps the flavors settle and the sauce to thicken slightly. The final dish should look vibrant, with the red peppers providing a pop of color against the dark, savory beef. The overall aroma should be balanced and appetizing, ready to be plated and served immediately to guests.
Common mistakes
A common mistake is overcrowding the slow cooker, which can lead to uneven cooking and excess liquid accumulation. Always ensure the ingredients are layered according to the instructions to allow for proper heat circulation.
Another error is failing to slice the meat against the grain, which results in a chewy, tough final dish regardless of how long it cooks. Finally, lifting the lid frequently to check on the progress releases trapped heat and steam, which can significantly increase the total cooking time and affect the final texture.
How to tell it’s done
The dish is considered done when the flank steak has reached an internal temperature of at least 145°F (63°C). At this point, the meat should be exceptionally tender and easy to pull apart with a fork.
The sauce should appear thick, glossy, and dark, coating the beef and vegetables thoroughly. If the sauce seems too thin, it can be reduced slightly in a saucepan, but generally, the slow cooking process provides the perfect consistency for serving over rice.
- Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest
Up next · Part 3 of 3
2 variations · storage & make-ahead · 3 answers · printable card
Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)