Add beef strips, oyster mushrooms, ¾ of the jar of BBQ Bulgogi Sauce and sesame oil into a bowl. Mix together by hand³ and leave to marinade for at least 20 minutes.
Meanwhile, bring a medium saucepan of water to the boil. Add the glass noodles and boil for 6 - 7 minutes. Drain and allow to sit.
Heat a large frying pan over medium heat. Add olive oil, onion and carrot and cook, stirring occasionally until soft. Drizzle with extra olive oil as needed.
Add the marinated ingredients to the pan and stir, cooking until the beef is cooked throughout.
Add baby spinach and stir, cooking until wilted.
Combine the glass noodles in a bowl with the remaining BBQ Bulgogi Sauce and a drizzle of sesame oil. Mix with hands until combined. Season with salt and pepper.
Combine the glass noodles in a bowl with the remaining BBQ Bulgogi Sauce and a drizzle of sesame oil. Mix with hands until combined. Season with salt and pepper.