Chicken Katsu Sushi Sandwich (Onigirazu) with Colourful Vegetables

Ingredients

• 1 boneless chicken breast, sliced in half horizontally and halved (four pieces)
• 1/4 cup (60 ml) buttermilk
• 1/2 teaspoon (2,5 ml) garlic salt
• To taste salt and freshly ground pepper
• 1/4 cup (60 ml) flour
• 1 whisked egg plus 3 tbsp (30 ml) water
• 2 cups (500 ml) Aki Sushi panko
• 1 cup (250 ml) red cabbage, thinly sliced
• 1 cup (250 ml) shredded carrots
• 1/3 cup (80 ml) pickled ginger
• 1 avocado, sliced
• 1 Lebanese cucumber, sliced
• 1/3 cup (80 ml) hoisin sauce
• 1/3 cup (80 ml) Aki Sushi Fuji sauce
• 4 Aki Sushi seaweed sheets
• 4 cups (1 L) cooked sushi rice
• 2 tablespoons (30 ml) rice vinegar
• 1 teaspoon (5 ml) maple syrup