Turn the tofu onto its side lengthwise and cut it into slices. Then, cut those slices into 2 triangles. This should yield between 8-16 triangles.
In a small bowl, whisk together the soy sauce, lemon juice, and agave or maple syrup. Set aside.
In a large frying pan over medium-high heat, heat the oil. Add the onion and bell pepper and saute for 1 minute. Stir in the garlic and ginger and saute for 1 more minute.
Place the tofu slices directly onto the pan (scoot the veggies out of the way with a spatula) and cook for 1 minute on each side.
Pour in the soy sauce mixture and add in the basil, cook for 3 minutes, flip the tofu slices over and cook for 3 more minutes.
Serve over brown rice (optional).
