Preparation
In a bowl, add the arugula, the Extra virgin olive oil, and the vinegar. Spread 1 tbsp. ’Nduja on 1 slice of bread. Layer 4 slices of mozzarella on another slice of bread. In large skillet, cook bread slices, covered, over medium-high heat until cheese melts for 1 1/2 minutes. Top ’Nduja toast with 3/4 cup arugula. Sandwich with cheese toast. Repeat with remaining ingredients.