This dish is a great example of the Japanese less-is-more approach to cooking. The ponzu is all the steak needs. The flavors are perfectly balanced and they get love-stoned when combined. I make this dish for parties and serve it sliced, family-style, with the ponzu cascading off the sliced steak. People turn into loiterers and sort of poach from the platter. It's like watching a flock of seagulls hovering. Hilarious. You'll see.