Place the tofu cubes in a large bowl and season with salt and pepper. Sprinkle with the flour and toss to coat. Shake to remove any excess flour. Set aside on a plate.
In a wok, heat the oil over medium-high heat. Fry half of the tofu at a time until light golden brown. Remove with a slotted spoon and drain on paper towels.
In a skillet off the heat, whisk together the remaining ingredients. Bring to a boil, whisking constantly. Add the tofu and coat with the sauce.
Insert a toothpick into each cube of tofu. Dip into the peanuts and place on a plate. Dab a bit of mayonnaise onto each tofu cube, top with a piece of ginger and sprinkle with the remaining peanuts.