Soba and Seared Tuna Salad Recipe

1 tablespoon sesame oil

1 tablepoon soy sauce

1 1/2 teaspoons mirin

1 teaspoon calamansi juice

1/4 teaspoon ginger, grated

1/4 teaspoon garlic, minced

1 teaspoon brown sugar

ground black pepper, to taste

1 200-gram piece sashimi-grade tuna, 1-inch-thick

200 grams soba noodles, dry

1 small avocado, flesh only

2 tablespoons plain yogurt

1 tablespoon sesame oil

1 teaspoon soy sauce

1 to 2 teaspoons calamansi juice

1/4 teaspoon ginger, grated

2 tablespoons butter

1 cup carrots, julienned

1/2 cup red and green bell peppers, cored and sliced

1/2 cup red radish, sliced into thin rounds

1/4 cup leeks, thinly sliced

1 1/2 cups purple cabbage, shredded

black sesame seeds, for garnish