In a medium bowl, whisk all ingredients together until smooth: sour cream (or Mexican crema), lime juice and zest, garlic, and kosher salt. Set aside (refrigerate if making well ahead of time). Serve as desired.
Notes
Feel free to adjust amounts of lime juice and garlic to suit your taste.
Makes about 8 2-tablespoon servings. Store refrigerated in an airtight container and enjoy within 5 days.