I first cut each piece of firm tofu in a box into halves (so it's thinner,) and then cut each of the halves diagonally so you get triangles.
Heat some oil in the pan, and fry the tofu pieces. It's hard to get these pieces "brown," but as long as you heat them well it's good.
After the tofu pieces are heated, pour in a couple tablespoons of soy sauce, and a tablespoon of sugar. Make sure each tofu piece is well coated with the sauce. Try to turn the pieces a couple times if you can.
As the soysauce-sugar mixture is reduced (watch out! soy sauce+sugar will burn easy), pour in a couple tablespoons of rice wine, and then sprinkle dry (or fresh) chopped chives and allow it to reduce. Voila!
I was not in the mood for spicy food (!) but if you are, adding some chili pepper flakes or a teaspoon hot chili sauce/oil would be great, too.