01 -
Preheat oven to 200°C. Line a baking sheet with parchment paper.
02 -
Spoon 9 small pools of honey evenly spaced onto the prepared parchment.
03 -
Divide thawed puff pastry into 9 equal squares.
04 -
Sprinkle fresh thyme leaves, sea salt, and black pepper over each honey pool, then top with a ring of onion and two slices of Gruyère cheese.
05 -
Place one pastry square atop each assembly. Brush each pastry top with beaten egg.
06 -
Bake for 20 minutes or until pastry is golden and puffed.
07 -
Carefully invert tarts onto a serving plate. Drizzle with remaining honey and garnish with extra thyme. Allow to cool for 5 minutes before serving.