Preheat the
oven to 200C/400F/Gas 5. Brush the sheets of filo
pastry lightly with egg white and cut into sixteen
10cm/4 in squares.
Layer the
squares in twos, in eight patty tins. Spoon the
cheese into the pastry cases. Season with salt and
ground black pepper and top with basil leaves.
Arrange the
tomato slices on the tarts, add seasoning and bake
for 10-12 minutes, until golden. Serve warm.