Lemon-Pepper Tuna Sandwich | Saveur

Ingredients

• 1 (4-oz.) can tuna, drained
• 2 tbsp. minced parsley
• 2 tbsp. red onion
• 2 tbsp. olive oil
• 1 tsp. coarse black pepper
• Zest and juice of 1 lemon
• Kosher salt, to taste
• 2 slices rye bread
• Red onion and arugula, for serving