1 small garlic clove, pressed or minced (or 1/2 teaspoon garlic powder)
1 tablespoon freshly-squeezed lemon juice (or red wine vinegar)
1 teaspoon Dijon mustard
1/2 teaspoon fine sea salt
1/4 teaspoon freshly-cracked black pepper
Whisk all ingredients together in a small bowl (or shake all ingredients together vigorously in a sealed jar) until completely combined.
Serve immediately or store in the refrigerator for between 1-7 days. (See notes on storage times below.) If you choose to refrigerate the dressing, it will need to be stirred or shaken again prior to serving.