Spring Fennel Sandwiches

Ingredients

• Filling
• ¹/₄ cup mascarpone cheese
  
• 1 teaspoon Dijon mustard
  
• 1 teaspoon snipped chives
  
• 1 teaspoon drained capers
  
• ¹/₄ teaspoon ground black pepper
  
• 4 small red radishes, very thinly sliced
  
• 2 cups shaved fennel bulb
  

• Topping
• 1 hard boiled egg, chopped
  
• 1 teaspoon lemon zest
  
• 1 teaspoon snipped fennel fronds
  
• 1 teaspoon chopped pistachio nuts
  
• 1 clove garlic, crushed
  
• 4 teaspoons olive oil
  
• 2 teaspoons lemon juice
  
• ¹/₄ teaspoon salt
  
• 4 sprigs fennel fronds for garnish