Cut salmon into thin slices as for sashimi
Mix lemon juice and soy sauce together in a bowl. Also works well with lime or yuzu juice instead of lemon.
Toss the salmon in the bowl with the soy and citrus mixture just before serving. Then drain the excess liquid.
Place the salmon slices on a plate. Serve with ponzu for dipping. Add sesame and watercress leaves as a garnish (optional)