Lightened-Up Tuna Sandwich | Savory

Ingredients

• 2 stalks celery
• 1 small carrot, peeled
• 1 small red pepper, seeded
• 2 tbsp nonfat plain Greek yogurt
• 2 tbsp lemon juice
• 2 tbsp light mayonnaise
• 2 tsp Dijon mustard
• 1/4 tsp garlic powder
• 2 (5 oz) cans solid white albacore tuna packed in water, drained
• 8 thin sliced whole -grain bread
• Lettuce and tomato slices, to garnish (optional)