Tuna & Avocado Onigiri - New Zealand Avocado

Ingredients

• 3 cups sushi rice
• 2 tbsp rice vinegar
• 1 tbsp sugar
• 1 tsp salt
• Filling
• 350g canned tuna in spring water, drained
• 1 avocado, mashed
• 3 tbsp Japanese mayonnaise (kewpie)
• 2 tsp soy sauce
• 1 tsp sesame oil
• 4 sheets nori, cut into strips
• 3 tbsp sesame seeds, lightly toasted in a dry frying pan