For the beef:
For the sauce:
In a medium bowl, place the beef, water, corn-starch, and soy sauce. Toss everything to coat and marinate for 10-30 minutes.
Heat coconut oil in a large skillet over high heat. Remove the beef from the marinade and sear the beef until browned, (2-3 minutes), then set it aside.
Add the bell pepper and green onion to the same pan and cook for 2-3 minutes. Next, add in the garlic, and cook for another 1 more minute.
Return the beef back to the pan along with the sauce. Cook until thickens, about 2-3 minutes.
Lastly, add in the Thai (or regular) basil and cook until it is just wilted. Serve immediately, garnished with green onions and sesame seeds alongside rice.