Wash and dry the tomatoes, then cut out the stalks. Put each tomato on its side and, with a large, sharp knife, slice it to the width of 2 x £l coins. Lay the slices out flat and slightly overlapping, spiralling them out to the edge of a large plate from the centre. Scatter generously with salt and plenty of pepper.
Peel the red onion and slice it very finely into rings. Separate the ri