Cut the beetroot into pieces, not too small and not too big. Don't grate it.
Mix the olive and the lemon juice and pour over the beetroot. Mix in the parsley as well, and season with salt and pepper.
Add the yoghurt and the grated garlic and spoon everything together till it becomes nice and pink. Sprinkle the pistachios on top and serve
Notes
Something to keep in mind is that raw garlic can be quite overpowering. It will also get stronger if you let it sit for longer. If you're not a fan of raw garlic, one clove is probably sufficient.