Slice the boneless steak very thinly and place it in the freezer for 30 minutes to firm it up.

In a large bowl, whisk together soy sauce or coconut aminos, sugar-free brown sweetener, sesame oil, minced garlic, and ginger paste until fully combined.

Add the sliced steak to the marinade, ensuring each piece is well-coated. Cover and marinate in the refrigerator for 2 hours, tossing occasionally.

Heat avocado oil in a large skillet over medium-high heat. Once hot, add marinated steak in batches and cook for 2-3 minutes, turning until caramelized.

Once cooked, garnish with toasted sesame seeds and serve with steamed cauliflower rice.