Toss it all in the blender…
1 cup homemade or purchased mayonnaise (the best one is Chosen Foods Avocado Oil Mayo)
1/2 cup plain kefir or buttermilk well shaken, more if dressing too thick
1 clove garlic
1 TBSP roughly shopped red onion
1 roughly chopped green onion or scallion (chives work here too)
1/2 tsp dry mustard
2 TBSP fresh dill
2 TBSP fresh parsley (flat leaf or Italian best)
1/2 tsp freshly ground pepper
1/2 tsp or to taste himalayan pink salt or good quality sea salt