Using a very sharp knife, carefully slice the sushi-grade salmon into thin rectangular pieces, each about ¼ inch thick. Aim for precision to ensure the sashimi maintains a tender texture. This process should take about 5 minutes. Arrange the salmon slices on a clean serving plate, making sure they are evenly spaced for presentation.

In a small bowl, combine the ponzu sauce, soy sauce, and sesame oil. Whisk them together briskly for about 30 seconds until fully blended. The mixture should have a smooth, glossy appearance. Set the bowl aside, allowing the flavors to meld while you prepare the sashimi.

Now, it’s time to plate your Spicy Salmon Sashimi! Begin by neatly arranging the salmon slices on your serving plate. Optionally, top each slice with a thin piece of jalapeño for an added spicy kick. Finally, drizzle the prepared sauce generously over the sashimi, ensuring each piece is well-coated for a burst of flavor with every bite. Enjoy immediately for the best experience!