How to Make It
In a bowl, beat the eggs with the all-purpose flour and arrowroot. Mix in the water just until blended; do not overmix. Let stand for 30 minutes. In a small bowl, combine the sansho with 1 teaspoon of salt and 1/4 teaspoon of white pepper.
Set the sardine fillets, skin side down, on a work surface and season with salt and white pepper. Top each fillet with a half slice of bacon and a shiso leaf half. Roll up the fillets, starting at the wider end; secure each roll with a toothpick.
In a large bowl, combine the lemon juice and zest with 1/4 cup of the grapeseed oil. Season with salt and white pepper. Add the apples, toss to coat and refrigerate for up to 1 hour.
Preheat the oven to 300°. In a medium saucepan, heat 2 inches of grapeseed oil to 350° or until a bread cube turns golden in 1 minute. Dredge each sardine roll in flour and shake off the excess. Dip 4 of the rolls in the batter and fry until golden brown and crisp all over, about 4 minutes. Transfer to a rack set over a large baking sheet to drain. Keep warm in the oven while you dredge and fry the remaining rolls.
Add the endives to the apple salad and toss well. Arrange the salad on 4 plates and set 3 sardine rolls beside each salad. Dust with the sansho mixture and serve.