Raita is one of the things I miss the most, it's lovely on pappadums and with falaffel. This is a simple recipe I made up which seems to taste pretty similar.
1/2 tub vegan sour cream (I used 1/2 340g Tofutti Sour Cream tub)
2 tsp agave syrup
1 Tbls dried mint
1 tsp lemon juice
Pinch of sea salt
Whisk ingredients in a bowl and add more of anything to taste.