Espuma

Drain the tuna and purée it with the cream cheese in a blender until you have a smooth mixture. Add the cream and season with salt and pepper. Pass the mixture through a sieve into a 0.5-liter siphon bottle (use 1 cartridge). Shake the bottle vigorously and refrigerate for 1-2 hours.

 

Quick-seared Tuna

Cut the fish into long, square blocks. Sear it for 20-30 seconds on each side. Cut the tuna into cubes and arrange as in the picture.