For the salad: 

1/2 lb fresh tuna

1/2 teaspoon coriander

1/2 teaspoon mustard powder

1/2 teaspoon sea salt

1/2 Tablespoon canola oil, for searing

1/2 bag fresh spinach

1 handful cilantro, chopped

1 plum, cut into small slices

1 handful almonds, slivered

Combine the coriander, mustard powder, and sea salt in a small bowl and stir together. Rub on both sides of the tuna. Heat the canola oil over medium-high heat, and once hot, sear the tuna for 2 minutes on both sides. Remove from the heat.

Slice into thin strips and serve over a salad of spinach, cilantro, plums, and almonds.

For the dressing: 

1 Tablespoon rice vinegar

2 Tablespoons soy sauce

1 Tablespoon sesame oil

4 Tablespoons canola oil, salt and pepper

Whisk all 4 ingredients together.