Put the oven on 220 degrees.

Draw a fish shape.

Put some flour on a rolling pin board.

Cut your puff pastry around your fish shape.

Crack the egg into a bowl

Stir it.

While that's happening cut around each space of puff pastry with the fish space.

Put each fish on a dish.

Use a circle cutter and stamp it into the middle in the fish. You'll find out later why you're doing it.

Use a clean paintbrush and paint across your fishes.

Put them in the oven for 8-10 minutes.

Melt the butter and flour into any pan.

Stir it around.

While your stirring add the milk.

Add the tuna.

Turn off the heat.

Take the pastry fishes out the oven.

Wait for them to call down.

Take the middle of 2 fishes out.

Add the filling in the middle.

If you want add some leaves to make it look like seaweed.