Cook the bacon and the sausages on a baking tray for 15 minutes, or until cooked through. Set aside to cool slightly
Unroll the pastry onto a lightly floured board and cut into six rectangles. Using a sharp knife, score a border 1cm from the edge so that it looks like a picture frame, but being careful not to cut all the way through the pastry
Transfer the pastry rectangles to a baking tray lined with baking parchment, leaving a small gap in between each tartlet
Spread 1 tsp of tomato purée over the centre of each tartlet, leaving the border clear. Chop the cooked bacon and sausages into small pieces and scatter over the tomato base, leaving a small area in the centre for the egg
Bake in the oven for 5 minutes, by which time the pastry border should have puffed up around the edge
Carefully crack a quail egg into the centre of each tartlet and bake for a further 5 minutes
Remove from the oven and scatter each tartlet with some chopped chives before serving immediately.