Add the red wine vinegar, Dijon mustard, minced garlic, dried oregano, sugar, salt, and pepper to a jar.
Pour in the olive oil.
Seal the jar and shake vigorously for 30 seconds until the dressing is fully emulsified.
Taste and adjust salt, pepper, or vinegar to your preference.
Use immediately or store in the refrigerator for up to one week. Shake well before each use.
Notes
For best results, prep all ingredients before starting this red wine vinaigrette. Taste as you go and adjust seasoning or sweetness to your preference. Store leftovers properly and enjoy within a few days for the best texture.