Preheat the oven to 180 oC
Roll out the pastry sheet
Cut into 4 equal sized rectangles and place on a lined baking sheet
Lightly score a border 1 cm from the edge of each rectangle and brush with a beaten egg
Prick the middle with a fork
Bake for 12 minutes then remove from the oven and press down the middle rectangle, this will give you room to fill the tart
Top with the salmon, red onion, rocket, avocado, chives and lemon zest