This sauce should have a thick consistency, so I avoid fat-free varieties, which get watery after standing a few minutes. I have to warn you, this sauce is intensely garlicky. Serving a store-bought lemon sorbet after a dinner with tzatziki eliminates some of the effects that garlic has on your breath.
If you want emerald green-colored sauce, add the dill and mint to the blender and blend again until the herbs are finely minced and tint the sauce.
If you want your sauce to remain white with flecks of green, remove the sauce from the blender to a serving bowl.
Finely mince the dill and mint and stir them into the sauce.
Add the olive oil, vinegar, and pepper.
Stir well.
Notes / Tips / Wine Advice:
Vary It! Substitute 1/2 cup sour cream for half the yogurt for a thicker and richer sauce. You can also try stirring 1 cup of ricotta or cottage cheese into the tzatziki sauce; then add a handful of diced radishes and serve the dish as a refreshing brunch entree.