Horizontally cut the tofu into 3 slices, wrap with a paper towel, and drain excess water.
Mix the finely chopped umeboshi, mayonnaise, mirin, and bonito flakes in a bowl. Add tofu cut into 1 cm cubes, and toss.
Sprinkle sesame seeds (not listed) if you like, serve in a bowl, then it's done.
Mayonnaise and soy sauce dressing with green onions: 2 teaspoons of soy sauce, 1 teaspoon of sugar, and 2 tablespoons of mayonnaise.