In a small bowl, whisk together coconut aminos, water, erythritol, minced garlic, and minced ginger to make the sauce.
Heat olive oil in a cast iron skillet over medium-high heat.
Add thinly sliced flank steak to the skillet and cook until browned, about 2-3 minutes per side.
Reduce heat to medium-low and pour the sauce over the cooked steak. Stir well to coat the steak evenly in the sauce.
Continue cooking for another 2-3 minutes until the sauce thickens slightly and coats the steak.
Remove from heat and garnish with chopped green onions and sesame seeds.
Serve hot over cauliflower rice if desired.
Enjoy your delicious Keto Mongolian Beef straight from the cast iron skillet! Adjust seasoning and ingredients according to taste preferences.
