Simple alternative - plain yoghurt, curry powder, mint. Mix and serve. Touch of sugar if you think it needs it.
Most of the restaurants will choose the quickest route to get dips ready. You can thin the mix a little as well, or add some tumeric - sparingly - as this will also flavour the dip. Too much will make it too bright and also not a pleasant flavour. Also add a little mustard powder if you like.
Try with greek yog. as above, or strained as above, or with creme fraiche.
Another way is pour some yog. into a coffee filter paper and leave to stand overnight in the fridge. When ready, add a little salt and mint plus curry powder.
Also try a dip made up with zahter herb mix for a nice alternative - ground thyme base with cumin, coriander, fennel, sesame seed and sumac. Available ready blended from most asian stores. makes a nice seasoning for lamb or add to thin yog. for a labneh drink. Serve with veg. fingers and warm flat bread for a Syrian special night...