2 tablespoons Dijon mustard
1 teaspoon dried oregano
1 clove garlic, minced
½ teaspoon kosher salt
¼ teaspoon ground black pepper
½ cup olive oil
2 tablespoons fresh lemon juice
Whisk red wine vinegar, Dijon mustard, oregano, garlic, salt, and black pepper together in a small bowl. Slowly stream olive oil into the vinegar mixture while whisking briskly. Beat lemon juice into the mixture. Pour dressing into a sealable jar or bottle, seal, and shake until emulsified.