This savory sauce would excellent with grilled chicken or lamb.
Line a sieve or colander with cheesecloth and set over a bowl, leaving at least 1/2-inch clearance from the bottom. (Alternatively, use a coffee filter lined with filter paper.) Spoon in yogurt, cover and let drain in the refrigerator for at least 30 minutes and up to 1 hour. Discard whey.
Whisk drained yogurt, garlic, oil and salt in a small bowl.
Make Ahead Tip: Cover and refrigerate for up to 1 day. Stir before using.