Kippers And Bits

Ingredients

• 2 tbsp/30 g low-fat mayonnaise
• 1 tbsp/15 ml nonfat Greek yogurt
• 1/8 tsp lemon zest
• 1 tsp/5 ml lemon juice
• 4 slices multigrain bread
• 4 leaves crisp lettuce (such as Boston, romaine or Bibb)
• 4 thick slices beefsteak tomato
• 4 thin slices Vidalia onion
• 2 (3 1/4 oz/91 g) cans kippers, drained
• 4 oz/112 g avocado, thinly sliced (optional)
• Freshly ground black pepper, to taste