Double skewer the shishito peppers, threading about 5 peppers onto each set of skewers.
Heat a charcoal or gas grill over medium-high heat and place the foil-wrapped bricks on the grill grate about 4 inches apart.
In a small bowl mix the salt with the sansho pepper. Spritz the peppers with the sake, then season with the sansho-salt. Set the pepeprs on the bricks so the ends of the skewers rest on the bricks and the peppers are elevated off of the grill grate. Cook until the peppers are blistered, 2½ to 3 minutes. Turn the skewers over, spritz the peppers with sake, season with sansho-salt and cook until blistered, 1½ to 2 minutes longer. Remove from the grill and serve warm with the shichimi togarashi on the side.