Combine ribeye with all the beef marinade ingredients in a bowl and place in the fridge until ready to cook.
Soak rice cakes for 10 minutes in hot water, and separate them. Drain. In a separate bowl, mix tteokbokki sauce ingredients and set aside.
Heat avocado oil in a large skillet over medium high heat. Add onions and beef, and cook stirring until the beef is lightly browned.
Add carrot, bell pepper, mushrooms, rice cakes, and the tteokbokki sauce, and simmer stirring for 3-4 minutes.
Taste to adjust seasoning. Remove from heat and serve, garnished with green onions and sesame seeds.
