German Plum Tart

I first made this a couple of years ago now, and it was one of the recipes that drew me to yeast cookery, made me want to do more. The inspirational force is Linda Collister – you just cannot read her without wanting to put on an apron and get your hands stuck into some flour – and this comes from Sweet Pies and Tarts. While the two yeasted flat tarts that follow this are more suitable for long, greed