Mediterranean Tuna Salad

• 2 Tbsp. fresh lemon juice
• 1/2 cup mayonnaise
• 1/2 cup bottled roasted red peppers , drained and chopped
• 2 cans (6 ounce each) packed in water light tuna , drained and rinsed
• 10 kalamata (brine-cured) black olives , pitted and chopped
• 1 large celery rib , chopped
• 1 scallion , finely chopped
• 2 Tbsp. Italian parsley , chopped
• 1 tsp. caraway seeds
• Salt and black pepper , to taste
• 1/4 cup toasted pignolis (pine nuts), for garnish
• Crackers or baguette slices , for serving