Lightly seared tuna is one of those lunch meals that tastes great and fills me up without leaving me feeling heavy afterwards. Sometimes I have trouble making sure the middle is warm without overcooking the outside. Cooking it with sous vide at a lower temperature ensures it is heated throughout without over cooking it at all. Finishing it off with a really quick sear adds some color and texture while leaving the rest of the tuna perfectly done.
Preheat a water bath to 110°F (43.3°C).
Mix together the spices in a small bowl. Lightly salt and pepper the tuna and sprinkle with some of the spice mixture. Then place in a sous vide bag, add the olive oil and seal. Cook until heated through, 20 to 60 minutes.
Place all the ingredients in a blender or food processor and process until smooth and creamy.
Gently remove the cooked tuna from the sous vide bag and dry it thoroughly using paper towels or a dish cloth. Lightly salt the tuna then very quickly sear it until the outside has browned. Cut it into slices.
Place the mixed greens on a plate and add the tuna. Top with the snow peas, mushrooms and radishes. Drizzle with the ginger-soy vinaigrette. Sprinkle with the sesame seeds then serve.