Arrange the chuck roast in the crockpot bowl. Toss the cubes of chuck roast with garlic powder, pepper, and chili flakes. Add the flour and toss again. To make the sauce, in a bowl or glass jar, combine all ingredients. Pour the sauce over the chuck roast. Cover and cook on LOW for 5 hours or on HIGH for 3 hours.: The bowl will smell faintly cool and metallic before cooking, but when you nest the cubed beef inside you start building the flavor base. As the pieces touch, they form a landscape that will hold sauce, and the close contact helps transmit heat evenly. A common mistake is overfilling the crockpot, which prevents proper circulation; leave some headspace so steam can move freely. Expect the raw beef to be slightly tacky to the touch, and know that as it cooks it will exude juices that become part of the sauce.
During the last hour of cooking, crank the heat to HIGH. Shred the meat in the sauce using two forks. Add the peppers and cook uncovered. Serve the meat and peppers over bowls of rice. Top with scallions and sesame seeds. Enjoy!: You will smell the sharpness of black pepper and a warm, faint heat from the chile flakes, while the garlic powder gives a round, savory note. This dry rub helps season each cube so every bite is flavorful, not just the exterior. If you skip this step, the interior of the meat can taste bland even after slow cooking. Make sure the seasoning is distributed evenly by tossing with your hands or a large spoon until the spices cling to the meat surface.
Add the flour and toss again: The flour will look dusty at first, but as you toss it coats the cubes and forms a thin veil that helps thicken the sauce during cooking. The flour also encourages slight browning when the meat is exposed to higher heat at the end, contributing to deeper flavor. Over-coating can create clumps, so shake off any excess. If you use a gluten-free blend, pick one that thickens similarly to wheat flour for best texture.
To make the sauce, in a bowl or glass jar, combine all ingredients: As you mix the tamari, orange marmalade, lemon juice, honey, grated garlic, ginger, gochujang, sesame oil and any other items, you will notice the sauce become glossy and viscous. Stirring releases citrus and honey aromas that hint at the finished profile. This step matters because a well emulsified sauce clings to the shredded beef , creating balanced bites. If the marmalade or gochujang is not fully incorporated, the flavor will be uneven, so whisk until smooth.
Pour the sauce over the chuck roast: The immediate contrast of cool meat and room temperature sauce produces a sweet, salty scent that starts to permeate the kitchen. Pour slowly so the sauce settles into the gaps between cubes and coats them thoroughly. This ensures the meat stews in the glaze rather than sitting in water. A common oversight is pouring unevenly, which can lead to pockets of underflavored meat, so tilt and rotate the crockpot bowl to distribute the sauce evenly.
Cover and cook on LOW for 5 hours or on HIGH for 3 hours: As the pot comes up to temperature you will hear a soft bubbling and the aroma will deepen into a toasty, savory perfume with traces of citrus. Slow cooking breaks down connective tissue, turning the chuck into tender shards; patience here equalizes texture and flavor. Avoid opening the lid repeatedly because each lift drops the internal temperature and lengthens the cooking time. Choose LOW for maximum tenderness, and HIGH when you need a shorter window.
During the last hour of cooking, crank the heat to HIGH: Turning the crockpot to a higher setting intensifies bubbling and helps the sauce reduce and thicken, concentrating flavors. You will hear a livelier simmer and see the sauce become more syrupy. This concentrated glaze clings to shredded beef and peppers for an irresistible finish. Be cautious, since too long on HIGH can dry the meat edges; monitor the texture and aroma as the sauce intensifies.
Shred the meat in the sauce using two forks: The meat will pull apart easily, fibers separating into silky ribbons that glisten with sauce. As you shred, the aroma becomes rich and meaty with sweet and spicy top notes. Shredding in the sauce allows the juices to reabsorb into the meat, keeping it moist. A frequent mistake is shredding on a cutting board away from the sauce, which loses those juices. Keep the meat immersed so it soaks up every bit of flavor.
Add the peppers and cook uncovered: Adding the sliced red bell peppers now preserves their texture and brightens the dish visually. Cooking uncovered encourages evaporation, thickening the sauce and slightly roasting the peppers in the residual heat. The peppers will soften but retain a bit of bite, offering contrast to the tender beef . If you add them too early they will become mushy, so time this addition for the final simmer.
Serve the meat and peppers over bowls of rice: As you spoon glossy shredded beef over steaming rice, the steam will lift the perfume of sesame and citrus. Rice catches the sauce and provides neutral balance, making each spoonful complete. Garnish with chopped green onions and sesame seeds for freshness and crunch. A common error is serving on cold rice, which mutes the aromas, so ensure your rice is hot and ready before plating.