Mix yoghurt with 1 pinch of salt. Line a sieve with kitchen paper. Put yoghurt on top and let it drain overnight. Wash the herbs, dab dry and chop finely. Put the drained yoghurt in a bowl.
Add herbs while stirring and season with salt and pepper. Clean and wash the rocket. Cut the bagels open, cover the lower part with some rocket and spread the yoghurt cream on top. Add 2 slices of salmon ham and some rocket again and place the bagel lids on top.
Serve bagels on plates garnished with some rocket and tomato.