Cut the top off each tomato and reserve. Scoop out the pulp and seeds and discard. Sprinkle the insides with salt, then turn upside-down to drain.
Put the garlic on a chopping board, sprinkle with salt and use a knife to crush to a paste. Put the garlic paste, stock, sun-dried tomatoes, bulgur wheat, mint, parsley, allspice and cayenne pepper, if using, in a bowl and stir. Season with s