In a mason jar mix all dressing ingredients together, add salt to taste and set aside.
For the red cabbage slaw
Slice the red cabbage thinly using a mandolin or a sharp knife. Cut the carrots in matchsticks or grate on a vegetable grater. Peel the mandarin oranges and separate into segments, cut each segment in half.
Chop the mint and cilantro. In a large bowl combine the red cabbage, carrots, orange segments, herbs and season with salt. Sprinkle with lemon juice and refrigerate for one hour for the cabbage to soften.
Before serving ddd the yogurt dressing and toss to coat. Arrange the red cabbage slaw on a platter and sprinkle with pomegranate seeds and pistachios. Sprinkle with 1 tsp sumac (optional).