Pre-heat the oven to 200C/gas mark 6. Cut the pastry into a circle about 25-30cms diameter or into a rectangular shape and place on a baking tray. Score a line with the tip of a knife about 1cm from the edge all the way around and prick the inner pastry all over with a fork.
Cut a piece of cardboard the same size as the interior pastry, wrap it in foil and place it on the pastry, leaving the pastry’s edge exposed. Brush the edge with the egg; bake for 12-15 minutes until the edge is golden.
Remove the cardboard. Mix the tomato paste, Dijon mustard and grated garlic together and brush over the base of the tart. Lay a layer of basil leaves on top. Arrange the tomatoes and peppers in lines with a line of crumbled feta in-between.
Season lightly and drizzle with the olive oil. Bake the tart for 20 -25 minutes.
To finish