1In a bowl, combine beef slices with Sacha sauce, soy sauce, oyster sauce, pepper, arrowroot starch, and water. Mix well by hand. Add 1 tbsp oil to keep the beef tender and juicy.
2In a clay pot (or saucepan), heat 1 tbsp oil over medium heat. Add shallot and garlic, sauté until fragrant, then add diced tomatoes. Stir well.
3Add ketchup and enough water to cover the tomatoes. Stir to combine.
4Add erythritol and salt, stir well, then cover and let it cook for 5 minutes.
5Uncover and add marinated beef slices. Optionally, add konjac knots. Cover and cook on high for 3 minutes.
6Turn off the heat, sprinkle with chopped cilantro, and enjoy!