This delicious recipe for warm tofu is courtesy of En Japanese Brasserie.
Divide tofu evenly between six 6-by-6-by-3-inch tofu boxes; set aside.
Place dashi, soy sauce, and mirin in a small saucepan and bring to a boil over medium-high heat; add bonito flakes.
Pour dashi mixture through a fine mesh sieve set over a medium bowl; let stand 2 minutes. Divide tofu in each box into 2 portions. Place each portion of tofu in a small bowl. Spoon 2 tablespoons of mixture over each bowl of tofu; serve immediately.
SourceThe Martha Stewart Show, April Spring 2008