Yogurt and Leek Puff Pastry Tartlets

Ingredients

• Tartlets

  • 1 medium leek, diced
  • 1 tbsp (15 ml) olive oil
  • 1/2 cup (125 ml) 11% plain yogurt (see note)
  • 1/2 cup (50 g) Gruyère cheese, grated
  • 1 sheet (200 g) store-bought puff pastry , thawed and chilled

• Toppings

  • 1/2 cup (125 ml) 11% plain yogurt
  • 1 lemon, zest finely grated
  • 2 tbsp chives, finely chopped, plus more for serving
  • 1 tbsp flat-leaf parsley, finely chopped, plus more for serving
  • 1 small Cortland apple, unpeeled, julienned and lightly drizzled with lemon juice
  • 4 radishes, thinly sliced