Place roast in a zip-lock bag or a container with a cover. Pour kombucha and liquid aminos over the roast and marinate 1-2 hours. Turn slow cooker on hugh to heat up. Heat olive oil in skillet over medium-lowish heat. Add onions and stir-fry until caramelized (about 15 minutes). Add marinated roast and brown the sides to lock in the flavor. Place roast in preheated slow cooker along with onions and carrots. Sprinkle everything evenly with herbs and spices. Turn slow cooker to low and cook for 6 1/2-7 hours.
Note: I found the best way to prepare this dish is to start the roast marinating around 8 or 9 in the morning. While it\’s marinating, chop the onions and carrots. Right before removing the roast from the fridge, caramelize the onions and preheat the slow cooker. Stick everything in by 10 and it\’s all ready for dinner!