Mum makes an easy one. Cucumber salad with garlic/sour cream. I guess u cud use low fat sour cream.

just chop the cucumber finely (peel it first).
season with salt.
add a little garlic (crushed)
then a few spoons of sour cream. mix. Make it a few hours earlier so it softens (put in fridge of course).

very easy and yummy.