Cut the ends of the beans, then cut them at 2 ½ to 3-inch long. Set Aside.
Sauté bacon in oil for about 2-3 minutes. Add the onion, garlic, and tomatoes and cook for 2 minutes.
Add the string beans and soy sauce. Let the string beans cook for 3 minutes or until its started to soften when you pinch it.
Add salt and ground black pepper if needed. Please be careful when adding salt. If you are not into too much salt, taste it first before adding the salt because the soy sauce might be enough. Remove from heat.