Ham, cheese and avocado sushi rolls

Ingredients

• 1 1/2 cup (300g) sushi rice
• 2 tablespoon rice wine vinegar
• 4 nori sheets, cut in half
• 1 1/2 tablespoon sesame seeds, toasted
• 2 teaspoon black sesame seeds, toasted
• 1 small avocado, mashed
• 12 slice shaved leg ham
• 1 small carrot, grated
• 50 gram low-fat cheddar cheese, cut into 1/2cm-thick strips