In a small mixing bowl or measuring cup, add the 3 tablespoons oil, mustard, soy sauce and sweetener of your choice. Mix together well.
Pat your tofu dry and make 4-5 slices, which you can then cut in half as well.
In a medium sized skillet, add the other 2-3 tablespoons oil and put on medium heat.
Place the tofu on the skillet and cook on high-medium heat. Continue frying tofu until it's a light-golden brown color. At this point you can add your sesame marinade and pour into the pan over the tofu.
After the tofu has cooked in the marinade for a few minutes you can add the scallions and cook for another couple of minutes. Serve and enjoy.