Place salmon in a bowl, preferably wooden. Combine olive oil, lime juice, orange juice, peppercorns, and balsamic cream in a separate bowl. Add dressing, capers, and dill to the salmon. Toss gently but well.
Decorate each plate with 3 chives.
Scoop avocado flesh into a food processor. Add papaya, lime juice, and salt and puree until completely smooth.
Beat cream in a bowl using an electric mixer until stiff peaks form. Fold avocado mixture into cream gently but thoroughly. Avocado mousse can be served in a freestanding gravy boat or placed around tartare on a plate.
