I like Tzatziki on lamb.
How is modern store tzatziki any less creamy chemical white sauce than Ranch? Rach is just a buttermilk base with some stuff on it:
Ranch dressing is a savory, creamy American salad dressing usually made from buttermilk, salt, garlic, onion, mustard, herbs (commonly chives, parsley and dill), and spices (commonly pepper, paprika and ground mustard seed) mixed into a sauce based on mayonnaise or another oil emulsion. Sour cream and yogurt are sometimes used in addition to, or as a substitute for, buttermilk and mayonnaise.