Heat the avocado oil in a large thick-bottomed pot (I use my Dutch oven) over medium-high heat. Add the chopped onion. Sauté, stirring occasionally, until the onion has softened, about 5 to 8 minutes.: The moment the oil shimmers you will sense the kitchen warming, and the surface of the pot should look glossy. This hot fat ensures the onion and ground beef start to sear on contact, creating tiny browned bits that carry tons of flavor. If the oil smokes, reduce the heat to medium, because overheating can char ingredients and create bitterness. A common mistake is adding food to a cold pan, which leads to steaming rather than browning, so wait until the oil moves freely in the pot.
Scoot the onions off to the side and place the ground beef in the center of the pot. Allow it to brown for 3 to 4 minutes before using a spatula to break it into small pieces.: As the onion hits the pot you will hear a gentle sizzle and smell a sharp, sweet scent that mellows as it cooks. Stir occasionally so the pieces soften evenly and develop flecks of golden color. This step builds the sweet backbone for the dish, since caramelized onion adds complexity. Avoid stirring constantly which prevents proper browning, and watch for burning at high heat.
Stir in the garlic, dried oregano, mushrooms, red bell pepper, sea salt and liquid aminos (or soy sauce) until well-combined.: During these minutes the texture will shift from crisp to tender, and translucent edges will appear, releasing a sweet aroma. Let the surface of some pieces brown lightly, that caramelization contributes depth. If you notice the pan drying, add a splash of oil or a tablespoon of water to prevent scorching. A typical error is cooking on too low heat, which yields pale, floppy onion without flavor development.
Add the chopped cabbage to the pot, then cover it with a lid and cook for 5 to 10 minutes, or until the cabbage has softened, stirring every few minutes.: When you push the softened onion aside you create an exposed hot spot for the ground beef . Placing the meat directly on the hot surface encourages rapid browning and that cherished Maillard crust. If the beef touches the pot and browns well you will smell a nutty, roasted note. Resist the urge to crowd the meat because overcrowding leads to steaming rather than browning.
Remove the lid and continue cooking until much of the liquid has evaporated off and the cabbage reaches your desired level of doneness, about 8 to 10 minutes.: As the meat sears it will release juices and begin to brown around the edges, producing a satisfying sizzle. Breaking it after a short sear keeps those flavorful crusts intact before you combine everything. If you break it too early you lose the concentrated browned bits, and if you wait too long you risk large clumps that cook unevenly.
Serve in bowls and enjoy!: You'll immediately notice a burst of aroma as the garlic hits the hot meat, and the mushrooms will begin releasing earthy moisture. The liquid aminos or soy sauce deepens the savory profile and deglazes any stuck bits, creating a glossy coating. Stir to incorporate everything so flavors marry, and beware of over-salting, since the sauce already adds saltiness.
Add the chopped cabbage to the pot then cover it with a lid and cook for 5 to 10 minutes or until the cabbage has softened stirring every few minutes: Steam will rise as the cabbage wilts, producing a sweet, vegetal perfume. The lid traps heat so the cabbage softens uniformly, and stirring now and then prevents the bottom layers from sticking. This enclosed cooking concentrates flavors and helps the ribbons collapse into tender strands. Do not skip the lid step, or the cabbage will take much longer to soften.
Remove the lid and continue cooking until much of the liquid has evaporated off and the cabbage reaches your desired level of doneness about 8 to 10 minutes: With the lid off you will hear a lively sizzle as steam escapes and the pot reduces, intensifying flavors and encouraging caramelization on the cabbage edges. Keep the heat at medium so the liquid can reduce without burning the bottom. Stir occasionally to expose different layers, and stop when the texture matches what you like, whether slightly crisp or fully tender. A common misstep is rushing this evaporation with too high heat which can scorch the ingredients.
Serve in bowls and enjoy: When you scoop the mixture into bowls you will notice a layered aroma of sweet onion , savory beef , and warm herbs, with glossy strands of cabbage catching the light. Garnish with the optional parsley if you like a fresh contrast. Let the pot rest briefly before serving to settle the juices, and avoid plating straight from a scorched bottom by gently scraping rather than scraping hard.