However, this is where it gets complicated and becomes a little bit of a chicken-or-egg situation: Yuzu is actually a vital ingredient in ponzu sauce. The yuzu incorporating recipe for ponzu sauce ...

Transfer the sliced steak to a serving platter and serve topped with the ponzu sauce.

Place in a serving sauce dish and garnish with the jalapeño ... Serve immediately with the Jalapeño Ponzu on the side. Recipe courtesy of Seoultown Kitchen by Debbie Lee/Kyle Books, 2011.